18139279 has 2 divisors, whose sum is σ = 18139280. Its totient is φ = 18139278.

The previous prime is 18139273. The next prime is 18139307. The reversal of 18139279 is 97293181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18139279 - 2³ = 18139271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18139271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9069639 + 9069640.

It is an arithmetic number, because the mean of its divisors is an integer number (9069640).

Almost surely, 2^18139279 is an apocalyptic number.

18139279 is a deficient number, since it is larger than the sum of its proper divisors (1).

18139279 is an equidigital number, since it uses as much as digits as its factorization.

18139279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 40.

The square root of 18139279 is about 4259.0232448297. The cubic root of 18139279 is about 262.7483557308.

The spelling of 18139279 in words is "eighteen million, one hundred thirty-nine thousand, two hundred seventy-nine".