18998965 has 8 divisors (see below), whose sum is σ = 22822560. Its totient is φ = 15183312.

The previous prime is 18998957. The next prime is 18998977. The reversal of 18998965 is 56989981.

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

It is a cyclic number.

It is not a de Polignac number, because 18998965 - 2³ = 18998957 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6922 + ... + 9268.

It is an arithmetic number, because the mean of its divisors is an integer number (2852820).

Almost surely, 2^18998965 is an apocalyptic number.

It is an amenable number.

18998965 is a deficient number, since it is larger than the sum of its proper divisors (3823595).

18998965 is a wasteful number, since it uses less digits than its factorization.

18998965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3971.

The product of its digits is 1399680, while the sum is 55.

The square root of 18998965 is about 4358.7802192815. The cubic root of 18998965 is about 266.8353195286.

The spelling of 18998965 in words is "eighteen million, nine hundred ninety-eight thousand, nine hundred sixty-five".