215904879 has 32 divisors (see below), whose sum is σ = 347855040. Its totient is φ = 131798016.

The previous prime is 215904869. The next prime is 215904883. The reversal of 215904879 is 978409512.

It is not a de Polignac number, because 215904879 - 2¹¹ = 215902831 is a prime.

It is a super-2 number, since 2×215904879² = 93229833552009282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215904859) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10627 + ... + 23339.

It is an arithmetic number, because the mean of its divisors is an integer number (10870470).

Almost surely, 2^215904879 is an apocalyptic number.

215904879 is a deficient number, since it is larger than the sum of its proper divisors (131950161).

215904879 is a wasteful number, since it uses less digits than its factorization.

215904879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12776 (or 12770 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 215904879 is about 14693.7020182117. The cubic root of 215904879 is about 599.9119120682.

It can be divided in two parts, 21 and 5904879, that added together give a square (5904900 = 2430²).

The spelling of 215904879 in words is "two hundred fifteen million, nine hundred four thousand, eight hundred seventy-nine".