18674388 has 30 divisors (see below), whose sum is σ = 48819386. Its totient is φ = 6224688.

The previous prime is 18674387. The next prime is 18674399. The reversal of 18674388 is 88347681.

It can be written as a sum of positive squares in only one way, i.e., 16548624 + 2125764 = 4068^2 + 1458^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18674387) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 28495 + ... + 29142.

Almost surely, 2^18674388 is an apocalyptic number.

18674388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18674388 is an abundant number, since it is smaller than the sum of its proper divisors (30144998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18674388 is a wasteful number, since it uses less digits than its factorization.

18674388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57653 (or 57642 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 18674388 is about 4321.3872772525. The cubic root of 18674388 is about 265.3070512310.

The spelling of 18674388 in words is "eighteen million, six hundred seventy-four thousand, three hundred eighty-eight".