18909452 has 12 divisors (see below), whose sum is σ = 33129600. Its totient is φ = 9443856.

The previous prime is 18909431. The next prime is 18909469. The reversal of 18909452 is 25490981.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between odd and even.

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 3 ways as a sum of consecutive naturals, for example, 2174 + ... + 6522.

It is an arithmetic number, because the mean of its divisors is an integer number (2760800).

Almost surely, 2^18909452 is an apocalyptic number.

It is a pronic number, being equal to 4348×4349.

It is an amenable number.

18909452 is a deficient number, since it is larger than the sum of its proper divisors (14220148).

18909452 is a wasteful number, since it uses less digits than its factorization.

18909452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5440 (or 5438 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 18909452 is about 4348.4999712545. The cubic root of 18909452 is about 266.4155977184.

The spelling of 18909452 in words is "eighteen million, nine hundred nine thousand, four hundred fifty-two".