215972973 has 20 divisors (see below), whose sum is σ = 325654560. Its totient is φ = 142630632.

The previous prime is 215972971. The next prime is 215972989. The reversal of 215972973 is 379279512.

It is not a de Polignac number, because 215972973 - 2¹ = 215972971 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215972971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3793 + ... + 21126.

It is an arithmetic number, because the mean of its divisors is an integer number (16282728).

Almost surely, 2^215972973 is an apocalyptic number.

It is an amenable number.

215972973 is a deficient number, since it is larger than the sum of its proper divisors (109681587).

215972973 is a wasteful number, since it uses less digits than its factorization.

215972973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25038 (or 25029 counting only the distinct ones).

The product of its digits is 238140, while the sum is 45.

The square root of 215972973 is about 14696.0189507227. The cubic root of 215972973 is about 599.9749739562.

The spelling of 215972973 in words is "two hundred fifteen million, nine hundred seventy-two thousand, nine hundred seventy-three".