38831521 has 4 divisors (see below), whose sum is σ = 40519872. Its totient is φ = 37143172.

The previous prime is 38831489. The next prime is 38831543. The reversal of 38831521 is 12513883.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12513883 = 53 ⋅236111.

It is a cyclic number.

It is not a de Polignac number, because 38831521 - 2⁵ = 38831489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38831591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 844141 + ... + 844186.

It is an arithmetic number, because the mean of its divisors is an integer number (10129968).

Almost surely, 2^38831521 is an apocalyptic number.

It is an amenable number.

38831521 is a deficient number, since it is larger than the sum of its proper divisors (1688351).

38831521 is a wasteful number, since it uses less digits than its factorization.

38831521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1688350.

The product of its digits is 5760, while the sum is 31.

The square root of 38831521 is about 6231.4942830753. The cubic root of 38831521 is about 338.6321078663.

The spelling of 38831521 in words is "thirty-eight million, eight hundred thirty-one thousand, five hundred twenty-one".