18917042 has 4 divisors (see below), whose sum is σ = 28375566. Its totient is φ = 9458520.

The previous prime is 18917029. The next prime is 18917053. The reversal of 18917042 is 24071981.

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., 18054001 + 863041 = 4249^2 + 929^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4729259 + ... + 4729262.

Almost surely, 2^18917042 is an apocalyptic number.

18917042 is a deficient number, since it is larger than the sum of its proper divisors (9458524).

18917042 is an equidigital number, since it uses as much as digits as its factorization.

18917042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9458523.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 18917042 is about 4349.3725984330. The cubic root of 18917042 is about 266.4512381642.

The spelling of 18917042 in words is "eighteen million, nine hundred seventeen thousand, forty-two".