Properties of the Number -1397

Three Hundred Ninety-Seven

Basics

Value: -1398 → -1397 → -1396

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 11 × 127

Divisors: 1, 11, 127, 1397

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10101110101

Octal: -2565

Duodecimal: -985

Hexadecimal: -575

Square: 1951609

Square Root: 37.376463182061514

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Expansion of (1-x)^-1/(1+2·x+2·x²-2·x³). A77932

Coordination sequence for "cab" 3D uniform tiling formed from octahedra and truncated cubes. A299266

Numbers > 1000 such that all the substrings of length = 3 are primes (substrings with leading '0' are considered to be nonprime). A211684

a(0) = 0. For n > 0, smallest non-palindromic number k such that the smallest palindrome in the Reverse and Add! trajectory of k is reached after exactly n iterations. A23109

Numbers whose sum of digits is 20. A235229

Total number of toothpicks in the toothpick structure A139250 that are parallel to the initial toothpick, after n odd rounds. A162795

Number of strict integer partitions of n whose length (number of parts) is not equal to the sum of any subset. A367215

Triangle read by rows: T(n,k) is the number of normal sequences of length n whose standard factorization into Lyndon words (aperiodic necklaces) has k factors. A296372

Numbers k whose largest divisor <= sqrt(k) is 11. A162531

Number of times prime(n) occurs as the least prime factor among numbers 1 .. prime(n)³: a(n) = A078898(A030078(n)). A250474