38991717 has 12 divisors (see below), whose sum is σ = 57520320. Its totient is φ = 25441128.

The previous prime is 38991679. The next prime is 38991737. The reversal of 38991717 is 71719983.

It is not a de Polignac number, because 38991717 - 2⁸ = 38991461 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38991737) 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, 45667 + ... + 46512.

It is an arithmetic number, because the mean of its divisors is an integer number (4793360).

Almost surely, 2^38991717 is an apocalyptic number.

It is an amenable number.

38991717 is a deficient number, since it is larger than the sum of its proper divisors (18528603).

38991717 is a wasteful number, since it uses less digits than its factorization.

38991717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92232 (or 92229 counting only the distinct ones).

The product of its digits is 95256, while the sum is 45.

The square root of 38991717 is about 6244.3347924339. The cubic root of 38991717 is about 339.0971345636.

The spelling of 38991717 in words is "thirty-eight million, nine hundred ninety-one thousand, seven hundred seventeen".