38957891 has 12 divisors (see below), whose sum is σ = 45520200. Its totient is φ = 33243840.

The previous prime is 38957869. The next prime is 38957909. The reversal of 38957891 is 19875983.

It is not a de Polignac number, because 38957891 - 2⁶ = 38957827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38957801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10160 + ... + 13458.

It is an arithmetic number, because the mean of its divisors is an integer number (3793350).

Almost surely, 2^38957891 is an apocalyptic number.

38957891 is a deficient number, since it is larger than the sum of its proper divisors (6562309).

38957891 is a wasteful number, since it uses less digits than its factorization.

38957891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3554 (or 3547 counting only the distinct ones).

The product of its digits is 544320, while the sum is 50.

The square root of 38957891 is about 6241.6256696473. The cubic root of 38957891 is about 338.9990486191. Note that the first 3 decimals are identical.

The spelling of 38957891 in words is "thirty-eight million, nine hundred fifty-seven thousand, eight hundred ninety-one".