215138079 has 16 divisors (see below), whose sum is σ = 343240800. Its totient is φ = 132392448.

The previous prime is 215138059. The next prime is 215138089. The reversal of 215138079 is 970831512.

It is not a de Polignac number, because 215138079 - 2⁸ = 215137823 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215138039) 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, 306114 + ... + 306815.

It is an arithmetic number, because the mean of its divisors is an integer number (21452550).

Almost surely, 2^215138079 is an apocalyptic number.

215138079 is a deficient number, since it is larger than the sum of its proper divisors (128102721).

215138079 is a wasteful number, since it uses less digits than its factorization.

215138079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612951 (or 612945 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 215138079 is about 14667.5859977026. The cubic root of 215138079 is about 599.2008611009.

It can be divided in two parts, 21513 and 8079, that added together give a palindrome (29592).

The spelling of 215138079 in words is "two hundred fifteen million, one hundred thirty-eight thousand, seventy-nine".