215723130 has 64 divisors (see below), whose sum is σ = 595703808. Its totient is φ = 48974400.

The previous prime is 215723117. The next prime is 215723161. The reversal of 215723130 is 31327512.

215723130 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 215723130.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28309 + ... + 35111.

It is an arithmetic number, because the mean of its divisors is an integer number (9307872).

Almost surely, 2^215723130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215723130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (297851904).

215723130 is an abundant number, since it is smaller than the sum of its proper divisors (379980678).

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

215723130 is a wasteful number, since it uses less digits than its factorization.

215723130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6971.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 215723130 is about 14687.5161276507. The cubic root of 215723130 is about 599.7435292758.

The spelling of 215723130 in words is "two hundred fifteen million, seven hundred twenty-three thousand, one hundred thirty".