215964 has 36 divisors (see below), whose sum is σ = 624624. Its totient is φ = 61632.

The previous prime is 215959. The next prime is 215981. The reversal of 215964 is 469512.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 177 + ... + 680.

2²¹⁵⁹⁶⁴ is an apocalyptic number.

It is an amenable number.

215964 is an abundant number, since it is smaller than the sum of its proper divisors (408660).

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

215964 is a wasteful number, since it uses less digits than its factorization.

215964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874 (or 869 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 215964 is about 464.7192700976. The cubic root of 215964 is about 59.9966664815.

The spelling of 215964 in words is "two hundred fifteen thousand, nine hundred sixty-four".