215542 has 8 divisors (see below), whose sum is σ = 330336. Its totient is φ = 105432.

The previous prime is 215531. The next prime is 215563. The reversal of 215542 is 245512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

215542 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1053 + ... + 1240.

It is an arithmetic number, because the mean of its divisors is an integer number (41292).

2²¹⁵⁵⁴² is an apocalyptic number.

215542 is a deficient number, since it is larger than the sum of its proper divisors (114794).

215542 is a wasteful number, since it uses less digits than its factorization.

215542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2342.

The product of its digits is 400, while the sum is 19.

The square root of 215542 is about 464.2650105274. The cubic root of 215542 is about 59.9575625841.

It can be divided in two parts, 2155 and 42, that added together give a cube (2197 = 13³).

The spelling of 215542 in words is "two hundred fifteen thousand, five hundred forty-two".