18664426 has 8 divisors (see below), whose sum is σ = 30541824. Its totient is φ = 8483820.

The previous prime is 18664417. The next prime is 18664433. The reversal of 18664426 is 62446681.

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

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, 424170 + ... + 424213.

It is an arithmetic number, because the mean of its divisors is an integer number (3817728).

Almost surely, 2^18664426 is an apocalyptic number.

18664426 is a deficient number, since it is larger than the sum of its proper divisors (11877398).

18664426 is a wasteful number, since it uses less digits than its factorization.

18664426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848396.

The product of its digits is 55296, while the sum is 37.

The square root of 18664426 is about 4320.2344843770. The cubic root of 18664426 is about 265.2598661245.

The spelling of 18664426 in words is "eighteen million, six hundred sixty-four thousand, four hundred twenty-six".