215340972 has 96 divisors (see below), whose sum is σ = 663344640. Its totient is φ = 52638720.

The previous prime is 215340901. The next prime is 215340991. The reversal of 215340972 is 279043512.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 8854 + ... + 22562.

It is an arithmetic number, because the mean of its divisors is an integer number (6909840).

Almost surely, 2^215340972 is an apocalyptic number.

215340972 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215340972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (331672320).

215340972 is an abundant number, since it is smaller than the sum of its proper divisors (448003668).

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

215340972 is a wasteful number, since it uses less digits than its factorization.

215340972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13751 (or 13749 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 215340972 is about 14674.5007410814. The cubic root of 215340972 is about 599.3891672388.

The spelling of 215340972 in words is "two hundred fifteen million, three hundred forty thousand, nine hundred seventy-two".