18240479 has 2 divisors, whose sum is σ = 18240480. Its totient is φ = 18240478.

The previous prime is 18240463. The next prime is 18240511. The reversal of 18240479 is 97404281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18240479 - 2⁴ = 18240463 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 (18240419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9120239 + 9120240.

It is an arithmetic number, because the mean of its divisors is an integer number (9120240).

Almost surely, 2^18240479 is an apocalyptic number.

18240479 is a deficient number, since it is larger than the sum of its proper divisors (1).

18240479 is an equidigital number, since it uses as much as digits as its factorization.

18240479 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 18240479 is about 4270.8873785198. The cubic root of 18240479 is about 263.2360788471.

The spelling of 18240479 in words is "eighteen million, two hundred forty thousand, four hundred seventy-nine".