38871521 has 10 divisors (see below), whose sum is σ = 42141642. Its totient is φ = 35855040.

The previous prime is 38871517. The next prime is 38871523. The reversal of 38871521 is 12517883.

It can be written as a sum of positive squares in 5 ways, for example, as 37075921 + 1795600 = 6089^2 + 1340^2 .

It is not a de Polignac number, because 38871521 - 2² = 38871517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38871523) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 27881 + ... + 29241.

Almost surely, 2^38871521 is an apocalyptic number.

It is an amenable number.

38871521 is a deficient number, since it is larger than the sum of its proper divisors (3270121).

38871521 is an frugal number, since it uses more digits than its factorization.

38871521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1413 (or 1374 counting only the distinct ones).

The product of its digits is 13440, while the sum is 35.

The square root of 38871521 is about 6234.7029600455. The cubic root of 38871521 is about 338.7483419262.

The spelling of 38871521 in words is "thirty-eight million, eight hundred seventy-one thousand, five hundred twenty-one".