38947731 has 16 divisors (see below), whose sum is σ = 55558944. Its totient is φ = 24182784.

The previous prime is 38947691. The next prime is 38947747. The reversal of 38947731 is 13774983.

It is not a de Polignac number, because 38947731 - 2⁷ = 38947603 is a prime.

It is a super-2 number, since 2×38947731² = 3033851500096722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (38947751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1011 + ... + 8883.

It is an arithmetic number, because the mean of its divisors is an integer number (3472434).

Almost surely, 2^38947731 is an apocalyptic number.

38947731 is a deficient number, since it is larger than the sum of its proper divisors (16611213).

38947731 is a wasteful number, since it uses less digits than its factorization.

38947731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7990.

The product of its digits is 127008, while the sum is 42.

The square root of 38947731 is about 6240.8117260497. The cubic root of 38947731 is about 338.9695763719.

The spelling of 38947731 in words is "thirty-eight million, nine hundred forty-seven thousand, seven hundred thirty-one".