38720931 has 4 divisors (see below), whose sum is σ = 51627912. Its totient is φ = 25813952.

The previous prime is 38720897. The next prime is 38720939. The reversal of 38720931 is 13902783.

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 38720931 - 2¹⁰ = 38719907 is a prime.

It is a super-2 number, since 2×38720931² = 2998620995013522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 38720892 and 38720901.

It is not an unprimeable number, because it can be changed into a prime (38720939) 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, 6453486 + ... + 6453491.

It is an arithmetic number, because the mean of its divisors is an integer number (12906978).

Almost surely, 2^38720931 is an apocalyptic number.

38720931 is a deficient number, since it is larger than the sum of its proper divisors (12906981).

38720931 is a wasteful number, since it uses less digits than its factorization.

38720931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12906980.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 38720931 is about 6222.6144826753. The cubic root of 38720931 is about 338.3103337732.

The spelling of 38720931 in words is "thirty-eight million, seven hundred twenty thousand, nine hundred thirty-one".