215667 has 12 divisors (see below), whose sum is σ = 321984. Its totient is φ = 138960.

The previous prime is 215659. The next prime is 215681. The reversal of 215667 is 766512.

It is not a de Polignac number, because 215667 - 2³ = 215659 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 215667.

It is not an unprimeable number, because it can be changed into a prime (215617) 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, 108 + ... + 665.

It is an arithmetic number, because the mean of its divisors is an integer number (26832).

2²¹⁵⁶⁶⁷ is an apocalyptic number.

215667 is a deficient number, since it is larger than the sum of its proper divisors (106317).

215667 is a wasteful number, since it uses less digits than its factorization.

215667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810 (or 807 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 215667 is about 464.3996124029. The cubic root of 215667 is about 59.9691508082.

The spelling of 215667 in words is "two hundred fifteen thousand, six hundred sixty-seven".