18474439 has 2 divisors, whose sum is σ = 18474440. Its totient is φ = 18474438.

The previous prime is 18474377. The next prime is 18474457. The reversal of 18474439 is 93447481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18474439 - 2⁷ = 18474311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18472439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9237219 + 9237220.

It is an arithmetic number, because the mean of its divisors is an integer number (9237220).

Almost surely, 2^18474439 is an apocalyptic number.

18474439 is a deficient number, since it is larger than the sum of its proper divisors (1).

18474439 is an equidigital number, since it uses as much as digits as its factorization.

18474439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 40.

The square root of 18474439 is about 4298.1902005379. The cubic root of 18474439 is about 264.3567595983.

The spelling of 18474439 in words is "eighteen million, four hundred seventy-four thousand, four hundred thirty-nine".