18040879 has 2 divisors, whose sum is σ = 18040880. Its totient is φ = 18040878.

The previous prime is 18040831. The next prime is 18040907. The reversal of 18040879 is 97804081.

It is a strong prime.

It is an emirp because it is prime and its reverse (97804081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18040879 - 2⁷ = 18040751 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18040679) 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, 9020439 + 9020440.

It is an arithmetic number, because the mean of its divisors is an integer number (9020440).

Almost surely, 2^18040879 is an apocalyptic number.

18040879 is a deficient number, since it is larger than the sum of its proper divisors (1).

18040879 is an equidigital number, since it uses as much as digits as its factorization.

18040879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 18040879 is about 4247.4555912923. The cubic root of 18040879 is about 262.2723843982.

The spelling of 18040879 in words is "eighteen million, forty thousand, eight hundred seventy-nine".