215294840 has 32 divisors (see below), whose sum is σ = 501120000. Its totient is φ = 83147904.

The previous prime is 215294839. The next prime is 215294843. The reversal of 215294840 is 48492512.

215294840 is digitally balanced in base 2, 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 215294840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215294843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91640 + ... + 93959.

It is an arithmetic number, because the mean of its divisors is an integer number (15660000).

Almost surely, 2^215294840 is an apocalyptic number.

215294840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215294840 is an abundant number, since it is smaller than the sum of its proper divisors (285825160).

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

215294840 is a wasteful number, since it uses less digits than its factorization.

215294840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185639 (or 185635 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 215294840 is about 14672.9288146573. The cubic root of 215294840 is about 599.3463622622.

The spelling of 215294840 in words is "two hundred fifteen million, two hundred ninety-four thousand, eight hundred forty".