38945931 has 4 divisors (see below), whose sum is σ = 51927912. Its totient is φ = 25963952.

The previous prime is 38945909. The next prime is 38945981. The reversal of 38945931 is 13954983.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 38945931 - 2⁵ = 38945899 is a prime.

It is a super-4 number, since 4×38945931⁴ (a number of 31 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (38945981) 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, 6490986 + ... + 6490991.

It is an arithmetic number, because the mean of its divisors is an integer number (12981978).

Almost surely, 2^38945931 is an apocalyptic number.

38945931 is a deficient number, since it is larger than the sum of its proper divisors (12981981).

38945931 is a wasteful number, since it uses less digits than its factorization.

38945931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12981980.

The product of its digits is 116640, while the sum is 42.

The square root of 38945931 is about 6240.6675123740. The cubic root of 38945931 is about 338.9643543763.

The spelling of 38945931 in words is "thirty-eight million, nine hundred forty-five thousand, nine hundred thirty-one".