18420574 has 8 divisors (see below), whose sum is σ = 28152360. Its totient is φ = 9036456.

The previous prime is 18420559. The next prime is 18420581. The reversal of 18420574 is 47502481.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86784 + ... + 86995.

It is an arithmetic number, because the mean of its divisors is an integer number (3519045).

Almost surely, 2^18420574 is an apocalyptic number.

18420574 is a deficient number, since it is larger than the sum of its proper divisors (9731786).

18420574 is a wasteful number, since it uses less digits than its factorization.

18420574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173834.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 18420574 is about 4291.9196171410. The cubic root of 18420574 is about 264.0995855550.

The spelling of 18420574 in words is "eighteen million, four hundred twenty thousand, five hundred seventy-four".