79439521 has 8 divisors (see below), whose sum is σ = 96128640. Its totient is φ = 64085568.

The previous prime is 79439519. The next prime is 79439561. The reversal of 79439521 is 12593497.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79439521 - 2¹ = 79439519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79439561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333661 + ... + 333898.

It is an arithmetic number, because the mean of its divisors is an integer number (12016080).

Almost surely, 2^79439521 is an apocalyptic number.

It is an amenable number.

79439521 is a deficient number, since it is larger than the sum of its proper divisors (16689119).

79439521 is a wasteful number, since it uses less digits than its factorization.

79439521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667583.

The product of its digits is 68040, while the sum is 40.

The square root of 79439521 is about 8912.8851108942. The cubic root of 79439521 is about 429.8783160281.

The spelling of 79439521 in words is "seventy-nine million, four hundred thirty-nine thousand, five hundred twenty-one".