38931999 has 8 divisors (see below), whose sum is σ = 51980592. Its totient is φ = 25919040.

The previous prime is 38931967. The next prime is 38932037. The reversal of 38931999 is 99913983.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 38931999 - 2⁵ = 38931967 is a prime.

It is a super-2 number, since 2×38931999² = 3031401092272002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38931929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6244 + ... + 10809.

It is an arithmetic number, because the mean of its divisors is an integer number (6497574).

Almost surely, 2^38931999 is an apocalyptic number.

38931999 is a deficient number, since it is larger than the sum of its proper divisors (13048593).

38931999 is a wasteful number, since it uses less digits than its factorization.

38931999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17817.

The product of its digits is 472392, while the sum is 51.

The square root of 38931999 is about 6239.5511857825. The cubic root of 38931999 is about 338.9239306873.

The spelling of 38931999 in words is "thirty-eight million, nine hundred thirty-one thousand, nine hundred ninety-nine".