38991713 has 4 divisors (see below), whose sum is σ = 39007920. Its totient is φ = 38975508.

The previous prime is 38991679. The next prime is 38991737. The reversal of 38991713 is 31719983.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 38991713 - 2⁶ = 38991649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38991613) 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, 3695 + ... + 9572.

It is an arithmetic number, because the mean of its divisors is an integer number (9751980).

Almost surely, 2^38991713 is an apocalyptic number.

It is an amenable number.

38991713 is a deficient number, since it is larger than the sum of its proper divisors (16207).

38991713 is a wasteful number, since it uses less digits than its factorization.

38991713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16206.

The product of its digits is 40824, while the sum is 41.

The square root of 38991713 is about 6244.3344721435. The cubic root of 38991713 is about 339.0971229681.

The spelling of 38991713 in words is "thirty-eight million, nine hundred ninety-one thousand, seven hundred thirteen".