18959879 has 8 divisors (see below), whose sum is σ = 20723328. Its totient is φ = 17268480.

The previous prime is 18959869. The next prime is 18959977. The reversal of 18959879 is 97895981.

It is a happy number.

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 18959879 - 2⁸ = 18959623 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 (18959839) 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, 17462 + ... + 18515.

It is an arithmetic number, because the mean of its divisors is an integer number (2590416).

Almost surely, 2^18959879 is an apocalyptic number.

18959879 is a deficient number, since it is larger than the sum of its proper divisors (1763449).

18959879 is a wasteful number, since it uses less digits than its factorization.

18959879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36025.

The product of its digits is 1632960, while the sum is 56.

The square root of 18959879 is about 4354.2943171081. The cubic root of 18959879 is about 266.6522098065.

The spelling of 18959879 in words is "eighteen million, nine hundred fifty-nine thousand, eight hundred seventy-nine".