18378428 has 12 divisors (see below), whose sum is σ = 34054272. Its totient is φ = 8648640.

The previous prime is 18378401. The next prime is 18378461. The reversal of 18378428 is 82487381.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135068 + ... + 135203.

It is an arithmetic number, because the mean of its divisors is an integer number (2837856).

Almost surely, 2^18378428 is an apocalyptic number.

It is an amenable number.

18378428 is a deficient number, since it is larger than the sum of its proper divisors (15675844).

18378428 is a wasteful number, since it uses less digits than its factorization.

18378428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270292 (or 270290 counting only the distinct ones).

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

The square root of 18378428 is about 4287.0068812634. The cubic root of 18378428 is about 263.8980131007.

The spelling of 18378428 in words is "eighteen million, three hundred seventy-eight thousand, four hundred twenty-eight".