18879879 has 12 divisors (see below), whose sum is σ = 25877544. Its totient is φ = 12243744.

The previous prime is 18879869. The next prime is 18879893. The reversal of 18879879 is 97897881.

It is not a de Polignac number, because 18879879 - 2¹³ = 18871687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18879859) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1809 + ... + 6405.

It is an arithmetic number, because the mean of its divisors is an integer number (2156462).

Almost surely, 2^18879879 is an apocalyptic number.

18879879 is a deficient number, since it is larger than the sum of its proper divisors (6997665).

18879879 is an equidigital number, since it uses as much as digits as its factorization.

18879879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4674 (or 4637 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 57.

The square root of 18879879 is about 4345.0982727667. The cubic root of 18879879 is about 266.2766404166.

The spelling of 18879879 in words is "eighteen million, eight hundred seventy-nine thousand, eight hundred seventy-nine".