18969388 has 48 divisors (see below), whose sum is σ = 36578304. Its totient is φ = 8581760.

The previous prime is 18969383. The next prime is 18969403. The reversal of 18969388 is 88396981.

It is not an unprimeable number, because it can be changed into a prime (18969383) 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 15 ways as a sum of consecutive naturals, for example, 177231 + ... + 177337.

It is an arithmetic number, because the mean of its divisors is an integer number (762048).

Almost surely, 2^18969388 is an apocalyptic number.

It is an amenable number.

18969388 is a deficient number, since it is larger than the sum of its proper divisors (17608916).

18969388 is a wasteful number, since it uses less digits than its factorization.

18969388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 220 counting only the distinct ones).

The product of its digits is 746496, while the sum is 52.

The square root of 18969388 is about 4355.3860908076. The cubic root of 18969388 is about 266.6967806270.

The spelling of 18969388 in words is "eighteen million, nine hundred sixty-nine thousand, three hundred eighty-eight".