215955 has 12 divisors (see below), whose sum is σ = 374400. Its totient is φ = 115152.

The previous prime is 215953. The next prime is 215959. The reversal of 215955 is 559512.

It is not a de Polignac number, because 215955 - 2¹ = 215953 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (215953) 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, 2355 + ... + 2444.

It is an arithmetic number, because the mean of its divisors is an integer number (31200).

2²¹⁵⁹⁵⁵ is an apocalyptic number.

215955 is a deficient number, since it is larger than the sum of its proper divisors (158445).

215955 is a wasteful number, since it uses less digits than its factorization.

215955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4810 (or 4807 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 215955 is about 464.7095867313. The cubic root of 215955 is about 59.9958330439.

The spelling of 215955 in words is "two hundred fifteen thousand, nine hundred fifty-five".