18402079 has 2 divisors, whose sum is σ = 18402080. Its totient is φ = 18402078.

The previous prime is 18402073. The next prime is 18402101. The reversal of 18402079 is 97020481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18402079 - 2¹³ = 18393887 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18402079.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18402073) 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 as a sum of consecutive naturals, namely, 9201039 + 9201040.

It is an arithmetic number, because the mean of its divisors is an integer number (9201040).

Almost surely, 2^18402079 is an apocalyptic number.

18402079 is a deficient number, since it is larger than the sum of its proper divisors (1).

18402079 is an equidigital number, since it uses as much as digits as its factorization.

18402079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 18402079 is about 4289.7644457476. The cubic root of 18402079 is about 264.0111670743.

The spelling of 18402079 in words is "eighteen million, four hundred two thousand, seventy-nine".