18378356 has 6 divisors (see below), whose sum is σ = 32162130. Its totient is φ = 9189176.

The previous prime is 18378337. The next prime is 18378379. The reversal of 18378356 is 65387381.

It can be written as a sum of positive squares in only one way, i.e., 16080100 + 2298256 = 4010^2 + 1516^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2297291 + ... + 2297298.

It is an arithmetic number, because the mean of its divisors is an integer number (5360355).

Almost surely, 2^18378356 is an apocalyptic number.

It is an amenable number.

18378356 is a deficient number, since it is larger than the sum of its proper divisors (13783774).

18378356 is a wasteful number, since it uses less digits than its factorization.

18378356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4594593 (or 4594591 counting only the distinct ones).

The product of its digits is 120960, while the sum is 41.

The square root of 18378356 is about 4286.9984837879. The cubic root of 18378356 is about 263.8976684815.

The spelling of 18378356 in words is "eighteen million, three hundred seventy-eight thousand, three hundred fifty-six".