18868279 has 2 divisors, whose sum is σ = 18868280. Its totient is φ = 18868278.

The previous prime is 18868231. The next prime is 18868301. The reversal of 18868279 is 97286881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18868279 - 2⁷ = 18868151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18868229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9434139 + 9434140.

It is an arithmetic number, because the mean of its divisors is an integer number (9434140).

Almost surely, 2^18868279 is an apocalyptic number.

18868279 is a deficient number, since it is larger than the sum of its proper divisors (1).

18868279 is an equidigital number, since it uses as much as digits as its factorization.

18868279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 49.

The square root of 18868279 is about 4343.7632301957. The cubic root of 18868279 is about 266.2220948367. Note that the first 3 decimals are identical.

The spelling of 18868279 in words is "eighteen million, eight hundred sixty-eight thousand, two hundred seventy-nine".