Properties of the Number -399001

Three Hundred Ninety-Nine Thousand One

Basics

Value: -399002 → -399001 → -399000

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 31 × 61 × 211

Divisors: 1, 31, 61, 211, 1891, 6541, 12871, 399001

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1100001011010011001

Octal: -1413231

Duodecimal: -172AA1

Hexadecimal: -61699

Square: 159201798001

Square Root: 631.6652594531379

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

Carmichael numbers: composite numbers k such that a^k-1 == 1 (mod k) for every a coprime to k. A2997

3-Carmichael numbers: Carmichael numbers equal to the product of 3 primes: k = p·q*r, where p < q < r are primes such that a^k-1 == 1 (mod k) if a is prime to k. A87788

Primary Carmichael numbers. A324316

Pseudoprimes to bases 2, 3 and 5. A83737

Absolute Euler pseudoprimes: odd composite numbers n such that a^(n-1/2) == +-1 (mod n) for every a coprime to n. A33181

a(n) is the smallest Carmichael number (A002997) with the n-th prime as its smallest prime divisor, or 0 if no such number exists. A135720

Composite integers k such that 2^k == 2 (mod k*(k+1)). A217465

Carmichael numbers ending in 1. A354609

Pseudoprimes to bases 2, 3, 5 and 7. A83739

Devaraj numbers: squarefree r-prime-factor (r>1) integers N=p1*...*pr such that φ(N)=(p1-1)*...*(pr-1) divides gcd(p1-1,...,pr-1)²*(N-1)^r-2. A104016