18968915 has 16 divisors (see below), whose sum is σ = 26102208. Its totient is φ = 12963456.

The previous prime is 18968909. The next prime is 18968921. The reversal of 18968915 is 51986981.

It is an interprime number because it is at equal distance from previous prime (18968909) and next prime (18968921).

It is a cyclic number.

It is not a de Polignac number, because 18968915 - 2¹⁰ = 18967891 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18968915.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 12329 + ... + 13781.

It is an arithmetic number, because the mean of its divisors is an integer number (1631388).

Almost surely, 2^18968915 is an apocalyptic number.

18968915 is a deficient number, since it is larger than the sum of its proper divisors (7133293).

18968915 is a wasteful number, since it uses less digits than its factorization.

18968915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1838.

The product of its digits is 155520, while the sum is 47.

The square root of 18968915 is about 4355.3317898870. The cubic root of 18968915 is about 266.6945639217.

The spelling of 18968915 in words is "eighteen million, nine hundred sixty-eight thousand, nine hundred fifteen".