18881279 has 8 divisors (see below), whose sum is σ = 19435920. Its totient is φ = 18331200.

The previous prime is 18881273. The next prime is 18881281. The reversal of 18881279 is 97218881.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18881279 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 (18881273) by changing a digit.

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, 8384 + ... + 10394.

It is an arithmetic number, because the mean of its divisors is an integer number (2429490).

Almost surely, 2^18881279 is an apocalyptic number.

18881279 is a deficient number, since it is larger than the sum of its proper divisors (554641).

18881279 is a wasteful number, since it uses less digits than its factorization.

18881279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2281.

The product of its digits is 64512, while the sum is 44.

The square root of 18881279 is about 4345.2593708546. The cubic root of 18881279 is about 266.2832219927.

The spelling of 18881279 in words is "eighteen million, eight hundred eighty-one thousand, two hundred seventy-nine".