18909936 has 50 divisors (see below), whose sum is σ = 54734592. Its totient is φ = 6302880.

The previous prime is 18909931. The next prime is 18909937. The reversal of 18909936 is 63990981.

It is a junction number, because it is equal to n+sod(n) for n = 18909891 and 18909900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18909931) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 6000 + ... + 8591.

Almost surely, 2^18909936 is an apocalyptic number.

18909936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18909936 is an abundant number, since it is smaller than the sum of its proper divisors (35824656).

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

18909936 is a wasteful number, since it uses less digits than its factorization.

18909936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14611 (or 14596 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 18909936 is about 4348.5556222728. Note that the first 3 decimals coincide. The cubic root of 18909936 is about 266.4178707271.

The spelling of 18909936 in words is "eighteen million, nine hundred nine thousand, nine hundred thirty-six".