38165981 has 16 divisors (see below), whose sum is σ = 45271680. Its totient is φ = 31492800.

The previous prime is 38165971. The next prime is 38166031. The reversal of 38165981 is 18956183.

It is a cyclic number.

It is not a de Polignac number, because 38165981 - 2⁶ = 38165917 is a prime.

It is a super-2 number, since 2×38165981² = 2913284211384722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38165971) 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, 25430 + ... + 26888.

It is an arithmetic number, because the mean of its divisors is an integer number (2829480).

Almost surely, 2^38165981 is an apocalyptic number.

It is an amenable number.

38165981 is a deficient number, since it is larger than the sum of its proper divisors (7105699).

38165981 is a wasteful number, since it uses less digits than its factorization.

38165981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1604.

The product of its digits is 51840, while the sum is 41.

The square root of 38165981 is about 6177.8621706866. The cubic root of 38165981 is about 336.6863244847.

The spelling of 38165981 in words is "thirty-eight million, one hundred sixty-five thousand, nine hundred eighty-one".