215427442 has 4 divisors (see below), whose sum is σ = 323141166. Its totient is φ = 107713720.

The previous prime is 215427427. The next prime is 215427479. The reversal of 215427442 is 244724512.

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

It can be written as a sum of positive squares in only one way, i.e., 177715561 + 37711881 = 13331^2 + 6141^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53856859 + ... + 53856862.

Almost surely, 2^215427442 is an apocalyptic number.

215427442 is a deficient number, since it is larger than the sum of its proper divisors (107713724).

215427442 is a wasteful number, since it uses less digits than its factorization.

215427442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107713723.

The product of its digits is 17920, while the sum is 31.

The square root of 215427442 is about 14677.4467125587. The cubic root of 215427442 is about 599.4693845875.

The spelling of 215427442 in words is "two hundred fifteen million, four hundred twenty-seven thousand, four hundred forty-two".