18909332 has 24 divisors (see below), whose sum is σ = 37514400. Its totient is φ = 8267616.

The previous prime is 18909311. The next prime is 18909337. The reversal of 18909332 is 23390981.

It is a junction number, because it is equal to n+sod(n) for n = 18909292 and 18909301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18909337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8582 + ... + 10557.

It is an arithmetic number, because the mean of its divisors is an integer number (1563100).

Almost surely, 2^18909332 is an apocalyptic number.

It is an amenable number.

18909332 is a deficient number, since it is larger than the sum of its proper divisors (18605068).

18909332 is a wasteful number, since it uses less digits than its factorization.

18909332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19175 (or 19173 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 18909332 is about 4348.4861733711. The cubic root of 18909332 is about 266.4150341565.

The spelling of 18909332 in words is "eighteen million, nine hundred nine thousand, three hundred thirty-two".