18998879 has 8 divisors (see below), whose sum is σ = 20045040. Its totient is φ = 17957376.

The previous prime is 18998873. The next prime is 18998887. The reversal of 18998879 is 97889981.

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 18998879 - 2¹² = 18994783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18998873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10097 + ... + 11829.

It is an arithmetic number, because the mean of its divisors is an integer number (2505630).

Almost surely, 2^18998879 is an apocalyptic number.

18998879 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18998879 is a deficient number, since it is larger than the sum of its proper divisors (1046161).

18998879 is a wasteful number, since it uses less digits than its factorization.

18998879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2329.

The product of its digits is 2612736, while the sum is 59.

The square root of 18998879 is about 4358.7703541251. The cubic root of 18998879 is about 266.8349169124.

The spelling of 18998879 in words is "eighteen million, nine hundred ninety-eight thousand, eight hundred seventy-nine".