38931357 has 4 divisors (see below), whose sum is σ = 51908480. Its totient is φ = 25954236.

The previous prime is 38931353. The next prime is 38931371. The reversal of 38931357 is 75313983.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 38931357 - 2² = 38931353 is a prime.

It is a super-2 number, since 2×38931357² = 3031301115722898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38931353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6488557 + ... + 6488562.

It is an arithmetic number, because the mean of its divisors is an integer number (12977120).

Almost surely, 2^38931357 is an apocalyptic number.

It is an amenable number.

38931357 is a deficient number, since it is larger than the sum of its proper divisors (12977123).

38931357 is a wasteful number, since it uses less digits than its factorization.

38931357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12977122.

The product of its digits is 68040, while the sum is 39.

The square root of 38931357 is about 6239.4997395625. The cubic root of 38931357 is about 338.9220676922.

The spelling of 38931357 in words is "thirty-eight million, nine hundred thirty-one thousand, three hundred fifty-seven".