215925240 has 96 divisors (see below), whose sum is σ = 660858480. Its totient is φ = 56429568.

The previous prime is 215925239. The next prime is 215925263. The reversal of 215925240 is 42529512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 215925198 and 215925207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1375242 + ... + 1375398.

Almost surely, 2^215925240 is an apocalyptic number.

215925240 is a gapful number since it is divisible by the number (20) 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 215925240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (330429240).

215925240 is an abundant number, since it is smaller than the sum of its proper divisors (444933240).

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

215925240 is a wasteful number, since it uses less digits than its factorization.

215925240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401 (or 240 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 215925240 is about 14694.3948497378. The cubic root of 215925240 is about 599.9307697900.

The spelling of 215925240 in words is "two hundred fifteen million, nine hundred twenty-five thousand, two hundred forty".