18130879 has 4 divisors (see below), whose sum is σ = 19525576. Its totient is φ = 16736184.

The previous prime is 18130867. The next prime is 18130909. The reversal of 18130879 is 97803181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18130879 - 2¹⁹ = 17606591 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 (18130379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 697329 + ... + 697354.

It is an arithmetic number, because the mean of its divisors is an integer number (4881394).

Almost surely, 2^18130879 is an apocalyptic number.

18130879 is a deficient number, since it is larger than the sum of its proper divisors (1394697).

18130879 is a wasteful number, since it uses less digits than its factorization.

18130879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1394696.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 18130879 is about 4258.0369890361. The cubic root of 18130879 is about 262.7077913298.

The spelling of 18130879 in words is "eighteen million, one hundred thirty thousand, eight hundred seventy-nine".