215972 has 6 divisors (see below), whose sum is σ = 377958. Its totient is φ = 107984.

The previous prime is 215959. The next prime is 215981. The reversal of 215972 is 279512.

215972 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 215296 + 676 = 464^2 + 26^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26993 + ... + 27000.

It is an arithmetic number, because the mean of its divisors is an integer number (62993).

2²¹⁵⁹⁷² is an apocalyptic number.

It is an amenable number.

215972 is a deficient number, since it is larger than the sum of its proper divisors (161986).

215972 is a wasteful number, since it uses less digits than its factorization.

215972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53997 (or 53995 counting only the distinct ones).

The product of its digits is 1260, while the sum is 26.

The square root of 215972 is about 464.7278773648. The cubic root of 215972 is about 59.9974072954.

The spelling of 215972 in words is "two hundred fifteen thousand, nine hundred seventy-two".