Properties of the Number 398

Three Hundred Ninety-Eight

Basics

Value: 397 → 398 → 399

Parity: even

Prime: No

Previous Prime: 397

Next Prime: 401

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 × 199

Divisors: 1, 2, 199, 398

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110001110

Octal: 616

Duodecimal: 292

Hexadecimal: 18e

Square: 158404

Square Root: 19.949937343260004

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

The primes doubled; even semiprimes. A100484

Number of compositions of the integer n into positive parts that avoid a fixed pattern of three letters. A102726

a(n) = n² - 2. A8865

Numbers k with A033676(k)=2, where A033676 is the largest divisor <= sqrt(k). A161344

Number of integer partitions of n that are empty, (1), or have at least two parts and these parts are pairwise coprime. A327516

Number of integer partitions of n such that every distinct submultiset has a different average. A316313

Numbers k such that Bernoulli number B_k has denominator 6. A51222

2 together with primes multiplied by 2. A1747

Triangle T(n,k) of numbers of distinct shapes under rotation of non-extendable (complete) non-self-adjacent simple paths within a square lattice bounded by rectangles with nodal dimensions n and k, n >= k >= 2. A213249

The Riordan square of the Riordan numbers, triangle read by rows, T(n, k) for 0 <= k <= n. A321620