18402479 has 2 divisors, whose sum is σ = 18402480. Its totient is φ = 18402478.

The previous prime is 18402473. The next prime is 18402491. The reversal of 18402479 is 97420481.

It is a weak prime.

It is an emirp because it is prime and its reverse (97420481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18402479 - 2⁴ = 18402463 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18402473) 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, 9201239 + 9201240.

It is an arithmetic number, because the mean of its divisors is an integer number (9201240).

Almost surely, 2^18402479 is an apocalyptic number.

18402479 is a deficient number, since it is larger than the sum of its proper divisors (1).

18402479 is an equidigital number, since it uses as much as digits as its factorization.

18402479 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 35.

The square root of 18402479 is about 4289.8110681008. The cubic root of 18402479 is about 264.0130799687.

It can be divided in two parts, 18402 and 479, that added together give a palindrome (18881).

The spelling of 18402479 in words is "eighteen million, four hundred two thousand, four hundred seventy-nine".