215942 has 4 divisors (see below), whose sum is σ = 323916. Its totient is φ = 107970.

The previous prime is 215939. The next prime is 215953. The reversal of 215942 is 249512.

215942 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53984 + ... + 53987.

It is an arithmetic number, because the mean of its divisors is an integer number (80979).

2²¹⁵⁹⁴² is an apocalyptic number.

215942 is a deficient number, since it is larger than the sum of its proper divisors (107974).

215942 is a wasteful number, since it uses less digits than its factorization.

215942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107973.

The product of its digits is 720, while the sum is 23.

The square root of 215942 is about 464.6955992905. The cubic root of 215942 is about 59.9946291489.

The spelling of 215942 in words is "two hundred fifteen thousand, nine hundred forty-two".