18402379 has 2 divisors, whose sum is σ = 18402380. Its totient is φ = 18402378.

The previous prime is 18402359. The next prime is 18402403. The reversal of 18402379 is 97320481.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18402379 is a prime.

It is not a weakly prime, because it can be changed into another prime (18402359) 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, 9201189 + 9201190.

It is an arithmetic number, because the mean of its divisors is an integer number (9201190).

Almost surely, 2^18402379 is an apocalyptic number.

18402379 is a deficient number, since it is larger than the sum of its proper divisors (1).

18402379 is an equidigital number, since it uses as much as digits as its factorization.

18402379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 18402379 is about 4289.7994125600. The cubic root of 18402379 is about 264.0126017477.

It can be divided in two parts, 18402 and 379, that added together give a palindrome (18781).

The spelling of 18402379 in words is "eighteen million, four hundred two thousand, three hundred seventy-nine".