18738428 has 12 divisors (see below), whose sum is σ = 33678792. Its totient is φ = 9115920.

The previous prime is 18738373. The next prime is 18738439. The reversal of 18738428 is 82483781.

It is a super-2 number, since 2×18738428² = 702257367822368, which contains 22 as substring.

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, 63158 + ... + 63453.

It is an arithmetic number, because the mean of its divisors is an integer number (2806566).

Almost surely, 2^18738428 is an apocalyptic number.

It is an amenable number.

18738428 is a deficient number, since it is larger than the sum of its proper divisors (14940364).

18738428 is a wasteful number, since it uses less digits than its factorization.

18738428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126652 (or 126650 counting only the distinct ones).

The product of its digits is 86016, while the sum is 41.

The square root of 18738428 is about 4328.7905932258. The cubic root of 18738428 is about 265.6099773372.

It can be divided in two parts, 1873 and 8428, that added together give a palindrome (10301).

The spelling of 18738428 in words is "eighteen million, seven hundred thirty-eight thousand, four hundred twenty-eight".