38649931 has 2 divisors, whose sum is σ = 38649932. Its totient is φ = 38649930.

The previous prime is 38649929. The next prime is 38649937. The reversal of 38649931 is 13994683.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 38649931 - 2¹ = 38649929 is a prime.

It is a super-2 number, since 2×38649931² = 2987634332609522, which contains 22 as substring.

Together with 38649929, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (38649937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19324965 + 19324966.

It is an arithmetic number, because the mean of its divisors is an integer number (19324966).

Almost surely, 2^38649931 is an apocalyptic number.

38649931 is a deficient number, since it is larger than the sum of its proper divisors (1).

38649931 is an equidigital number, since it uses as much as digits as its factorization.

38649931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 43.

The square root of 38649931 is about 6216.9068675669. The cubic root of 38649931 is about 338.1034281939.

The spelling of 38649931 in words is "thirty-eight million, six hundred forty-nine thousand, nine hundred thirty-one".