38160721 has 16 divisors (see below), whose sum is σ = 42127360. Its totient is φ = 34428240.

The previous prime is 38160719. The next prime is 38160739. The reversal of 38160721 is 12706183.

It is a cyclic number.

It is not a de Polignac number, because 38160721 - 2¹ = 38160719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38160721.

It is not an unprimeable number, because it can be changed into a prime (38160751) 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, 38980 + ... + 39946.

It is an arithmetic number, because the mean of its divisors is an integer number (2632960).

Almost surely, 2^38160721 is an apocalyptic number.

38160721 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

38160721 is a deficient number, since it is larger than the sum of its proper divisors (3966639).

38160721 is a wasteful number, since it uses less digits than its factorization.

38160721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 38160721 is about 6177.4364424088. The cubic root of 38160721 is about 336.6708565088.

The spelling of 38160721 in words is "thirty-eight million, one hundred sixty thousand, seven hundred twenty-one".