38685531 has 4 divisors (see below), whose sum is σ = 51580712. Its totient is φ = 25790352.

The previous prime is 38685503. The next prime is 38685587. The reversal of 38685531 is 13558683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13558683 = 3 ⋅4519561.

It is not a de Polignac number, because 38685531 - 2⁶ = 38685467 is a prime.

It is a super-2 number, since 2×38685531² = 2993140617503922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38685531.

It is not an unprimeable number, because it can be changed into a prime (38685631) 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, 6447586 + ... + 6447591.

It is an arithmetic number, because the mean of its divisors is an integer number (12895178).

Almost surely, 2^38685531 is an apocalyptic number.

38685531 is a deficient number, since it is larger than the sum of its proper divisors (12895181).

38685531 is a wasteful number, since it uses less digits than its factorization.

38685531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12895180.

The product of its digits is 86400, while the sum is 39.

The square root of 38685531 is about 6219.7693687146. The cubic root of 38685531 is about 338.2072040443.

The spelling of 38685531 in words is "thirty-eight million, six hundred eighty-five thousand, five hundred thirty-one".