215139930 has 64 divisors (see below), whose sum is σ = 570509568. Its totient is φ = 51645440.

The previous prime is 215139887. The next prime is 215139943. The reversal of 215139930 is 39931512.

215139930 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 215139891 and 215139900.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2560 + ... + 20900.

It is an arithmetic number, because the mean of its divisors is an integer number (8914212).

Almost surely, 2^215139930 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215139930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285254784).

215139930 is an abundant number, since it is smaller than the sum of its proper divisors (355369638).

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

215139930 is a wasteful number, since it uses less digits than its factorization.

215139930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18391.

The product of its (nonzero) digits is 7290, while the sum is 33.

The square root of 215139930 is about 14667.6490958845. The cubic root of 215139930 is about 599.2025795595.

The spelling of 215139930 in words is "two hundred fifteen million, one hundred thirty-nine thousand, nine hundred thirty".