215872 has 14 divisors (see below), whose sum is σ = 428498. Its totient is φ = 107904.

The previous prime is 215863. The next prime is 215893. The reversal of 215872 is 278512.

215872 is digitally balanced in base 3, 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 + 576 = 464^2 + 24^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1623 + ... + 1750.

It is an arithmetic number, because the mean of its divisors is an integer number (30607).

2²¹⁵⁸⁷² is an apocalyptic number.

It is an amenable number.

215872 is a deficient number, since it is larger than the sum of its proper divisors (212626).

215872 is an equidigital number, since it uses as much as digits as its factorization.

215872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3385 (or 3375 counting only the distinct ones).

The product of its digits is 1120, while the sum is 25.

The square root of 215872 is about 464.6202750634. The cubic root of 215872 is about 59.9881458063.

The spelling of 215872 in words is "two hundred fifteen thousand, eight hundred seventy-two".