38915791 has 2 divisors, whose sum is σ = 38915792. Its totient is φ = 38915790.

The previous prime is 38915759. The next prime is 38915797. The reversal of 38915791 is 19751983.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 38915791 - 2⁵ = 38915759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38915797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19457895 + 19457896.

It is an arithmetic number, because the mean of its divisors is an integer number (19457896).

Almost surely, 2^38915791 is an apocalyptic number.

38915791 is a deficient number, since it is larger than the sum of its proper divisors (1).

38915791 is an equidigital number, since it uses as much as digits as its factorization.

38915791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 43.

The square root of 38915791 is about 6238.2522392093. The cubic root of 38915791 is about 338.8768910481.

The spelling of 38915791 in words is "thirty-eight million, nine hundred fifteen thousand, seven hundred ninety-one".