215972442 has 24 divisors (see below), whose sum is σ = 534789216. Its totient is φ = 61706376.

The previous prime is 215972429. The next prime is 215972447. The reversal of 215972442 is 244279512.

215972442 is a `hidden beast` number, since 2 + 1 + 597 + 24 + 42 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 215972397 and 215972406.

It is not an unprimeable number, because it can be changed into a prime (215972447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 856908 + ... + 857159.

It is an arithmetic number, because the mean of its divisors is an integer number (22282884).

Almost surely, 2^215972442 is an apocalyptic number.

215972442 is an abundant number, since it is smaller than the sum of its proper divisors (318816774).

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

215972442 is a wasteful number, since it uses less digits than its factorization.

215972442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714082 (or 1714079 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 215972442 is about 14696.0008845944. Note that the first 3 decimals coincide. The cubic root of 215972442 is about 599.9744822481.

The spelling of 215972442 in words is "two hundred fifteen million, nine hundred seventy-two thousand, four hundred forty-two".