215642 has 16 divisors (see below), whose sum is σ = 376512. Its totient is φ = 90720.

The previous prime is 215617. The next prime is 215653. The reversal of 215642 is 246512.

It is a happy number.

215642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 917 + ... + 1127.

It is an arithmetic number, because the mean of its divisors is an integer number (23532).

2²¹⁵⁶⁴² is an apocalyptic number.

215642 is a deficient number, since it is larger than the sum of its proper divisors (160870).

215642 is a wasteful number, since it uses less digits than its factorization.

215642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293.

The product of its digits is 480, while the sum is 20.

The square root of 215642 is about 464.3726951491. The cubic root of 215642 is about 59.9668335216.

The spelling of 215642 in words is "two hundred fifteen thousand, six hundred forty-two".