18989907 has 8 divisors (see below), whose sum is σ = 25421760. Its totient is φ = 12609000.

The previous prime is 18989899. The next prime is 18989909. The reversal of 18989907 is 70998981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18989907 - 2³ = 18989899 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18989907.

It is not an unprimeable number, because it can be changed into a prime (18989909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11857 + ... + 13362.

It is an arithmetic number, because the mean of its divisors is an integer number (3177720).

Almost surely, 2^18989907 is an apocalyptic number.

18989907 is a deficient number, since it is larger than the sum of its proper divisors (6431853).

18989907 is a wasteful number, since it uses less digits than its factorization.

18989907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25473.

The product of its (nonzero) digits is 326592, while the sum is 51.

The square root of 18989907 is about 4357.7410432471. The cubic root of 18989907 is about 266.7929070685.

The spelling of 18989907 in words is "eighteen million, nine hundred eighty-nine thousand, nine hundred seven".