215705930 has 32 divisors (see below), whose sum is σ = 435024000. Its totient is φ = 76317120.

The previous prime is 215705929. The next prime is 215705951. The reversal of 215705930 is 39507512.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22430 + ... + 30569.

It is an arithmetic number, because the mean of its divisors is an integer number (13594500).

Almost surely, 2^215705930 is an apocalyptic number.

215705930 is an abundant number, since it is smaller than the sum of its proper divisors (219318070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215705930 is a wasteful number, since it uses less digits than its factorization.

215705930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53054.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 215705930 is about 14686.9305847069. The cubic root of 215705930 is about 599.7275893024.

The spelling of 215705930 in words is "two hundred fifteen million, seven hundred five thousand, nine hundred thirty".