38721081 has 16 divisors (see below), whose sum is σ = 59399168. Its totient is φ = 21978000.

The previous prime is 38721073. The next prime is 38721083. The reversal of 38721081 is 18012783.

It is a happy number.

It is not a de Polignac number, because 38721081 - 2³ = 38721073 is a prime.

It is a super-2 number, since 2×38721081² = 2998644227617122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38721083) 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, 2935 + ... + 9276.

It is an arithmetic number, because the mean of its divisors is an integer number (3712448).

Almost surely, 2^38721081 is an apocalyptic number.

It is an amenable number.

38721081 is a deficient number, since it is larger than the sum of its proper divisors (20678087).

38721081 is a wasteful number, since it uses less digits than its factorization.

38721081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12372.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 38721081 is about 6222.6265354752. The cubic root of 38721081 is about 338.3107706298.

The spelling of 38721081 in words is "thirty-eight million, seven hundred twenty-one thousand, eighty-one".