38981665 has 16 divisors (see below), whose sum is σ = 48988800. Its totient is φ = 29721472.

The previous prime is 38981603. The next prime is 38981669. The reversal of 38981665 is 56618983.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38981665 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38981669) 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, 47781 + ... + 48589.

It is an arithmetic number, because the mean of its divisors is an integer number (3061800).

Almost surely, 2^38981665 is an apocalyptic number.

It is an amenable number.

38981665 is a deficient number, since it is larger than the sum of its proper divisors (10007135).

38981665 is a wasteful number, since it uses less digits than its factorization.

38981665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256.

The product of its digits is 311040, while the sum is 46.

The square root of 38981665 is about 6243.5298509737. The cubic root of 38981665 is about 339.0679924995.

The spelling of 38981665 in words is "thirty-eight million, nine hundred eighty-one thousand, six hundred sixty-five".