18396388 has 12 divisors (see below), whose sum is σ = 32230912. Its totient is φ = 9187560.

The previous prime is 18396383. The next prime is 18396407. The reversal of 18396388 is 88369381.

It is not an unprimeable number, because it can be changed into a prime (18396383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2233 + ... + 6463.

Almost surely, 2^18396388 is an apocalyptic number.

It is an amenable number.

18396388 is a deficient number, since it is larger than the sum of its proper divisors (13834524).

18396388 is a wasteful number, since it uses less digits than its factorization.

18396388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5322 (or 5320 counting only the distinct ones).

The product of its digits is 248832, while the sum is 46.

The square root of 18396388 is about 4289.1010713202. The cubic root of 18396388 is about 263.9839483660.

The spelling of 18396388 in words is "eighteen million, three hundred ninety-six thousand, three hundred eighty-eight".