215388930 has 64 divisors (see below), whose sum is σ = 536380416. Its totient is φ = 55353600.

The previous prime is 215388917. The next prime is 215388931. The reversal of 215388930 is 39883512.

It is not an unprimeable number, because it can be changed into a prime (215388931) 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, 893610 + ... + 893850.

It is an arithmetic number, because the mean of its divisors is an integer number (8380944).

Almost surely, 2^215388930 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215388930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268190208).

215388930 is an abundant number, since it is smaller than the sum of its proper divisors (320991486).

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

215388930 is an equidigital number, since it uses as much as digits as its factorization.

215388930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 215388930 is about 14676.1347091119. The cubic root of 215388930 is about 599.4336600444.

The spelling of 215388930 in words is "two hundred fifteen million, three hundred eighty-eight thousand, nine hundred thirty".