18909268 has 24 divisors (see below), whose sum is σ = 38441984. Its totient is φ = 7970400.

The previous prime is 18909259. The next prime is 18909283. The reversal of 18909268 is 86290981.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 3828 + ... + 7243.

Almost surely, 2^18909268 is an apocalyptic number.

It is an amenable number.

18909268 is an abundant number, since it is smaller than the sum of its proper divisors (19532716).

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

18909268 is a wasteful number, since it uses less digits than its factorization.

18909268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11143 (or 11141 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 18909268 is about 4348.4788144821. The cubic root of 18909268 is about 266.4147335892.

The spelling of 18909268 in words is "eighteen million, nine hundred nine thousand, two hundred sixty-eight".