18426644 has 12 divisors (see below), whose sum is σ = 32793600. Its totient is φ = 9057048.

The previous prime is 18426607. The next prime is 18426659. The reversal of 18426644 is 44662481.

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, 38804 + ... + 39275.

It is an arithmetic number, because the mean of its divisors is an integer number (2732800).

Almost surely, 2^18426644 is an apocalyptic number.

It is an amenable number.

18426644 is a deficient number, since it is larger than the sum of its proper divisors (14366956).

18426644 is a wasteful number, since it uses less digits than its factorization.

18426644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78142 (or 78140 counting only the distinct ones).

The product of its digits is 36864, while the sum is 35.

The square root of 18426644 is about 4292.6267016828. The cubic root of 18426644 is about 264.1285913184.

The spelling of 18426644 in words is "eighteen million, four hundred twenty-six thousand, six hundred forty-four".