18947268 has 36 divisors (see below), whose sum is σ = 48090588. Its totient is φ = 6289920.

The previous prime is 18947213. The next prime is 18947311. The reversal of 18947268 is 86274981.

It can be written as a sum of positive squares in 2 ways, for example, as 5419584 + 13527684 = 2328^2 + 3678^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9180 + ... + 11052.

Almost surely, 2^18947268 is an apocalyptic number.

18947268 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18947268 is an abundant number, since it is smaller than the sum of its proper divisors (29143320).

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

18947268 is a wasteful number, since it uses less digits than its factorization.

18947268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2164 (or 2159 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 18947268 is about 4352.8459655724. The cubic root of 18947268 is about 266.5930762213.

The spelling of 18947268 in words is "eighteen million, nine hundred forty-seven thousand, two hundred sixty-eight".