38087721 has 24 divisors (see below), whose sum is σ = 63277760. Its totient is φ = 21625056.

The previous prime is 38087713. The next prime is 38087767. The reversal of 38087721 is 12778083.

It is not a de Polignac number, because 38087721 - 2³ = 38087713 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (38087711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8415 + ... + 12123.

Almost surely, 2^38087721 is an apocalyptic number.

It is an amenable number.

38087721 is a deficient number, since it is larger than the sum of its proper divisors (25190039).

38087721 is a wasteful number, since it uses less digits than its factorization.

38087721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3885 (or 3882 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 38087721 is about 6171.5250141274. The cubic root of 38087721 is about 336.4560399805.

The spelling of 38087721 in words is "thirty-eight million, eighty-seven thousand, seven hundred twenty-one".