38697931 has 4 divisors (see below), whose sum is σ = 38779200. Its totient is φ = 38616664.

The previous prime is 38697917. The next prime is 38697947. The reversal of 38697931 is 13979683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13979683 = 1721 ⋅8123.

It is a cyclic number.

It is not a de Polignac number, because 38697931 - 2¹⁵ = 38665163 is a prime.

It is a super-2 number, since 2×38697931² = 2995059727361522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38697961) 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, 39916 + ... + 40873.

It is an arithmetic number, because the mean of its divisors is an integer number (9694800).

Almost surely, 2^38697931 is an apocalyptic number.

38697931 is a deficient number, since it is larger than the sum of its proper divisors (81269).

38697931 is an equidigital number, since it uses as much as digits as its factorization.

38697931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81268.

The product of its digits is 244944, while the sum is 46.

The square root of 38697931 is about 6220.7661103758. The cubic root of 38697931 is about 338.2433357385.

The spelling of 38697931 in words is "thirty-eight million, six hundred ninety-seven thousand, nine hundred thirty-one".