18749459 has 2 divisors, whose sum is σ = 18749460. Its totient is φ = 18749458.

The previous prime is 18749443. The next prime is 18749473. The reversal of 18749459 is 95494781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18749459 - 2⁴ = 18749443 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18749429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9374729 + 9374730.

It is an arithmetic number, because the mean of its divisors is an integer number (9374730).

Almost surely, 2^18749459 is an apocalyptic number.

18749459 is a deficient number, since it is larger than the sum of its proper divisors (1).

18749459 is an equidigital number, since it uses as much as digits as its factorization.

18749459 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The square root of 18749459 is about 4330.0645491724. The cubic root of 18749459 is about 265.6620871676.

The spelling of 18749459 in words is "eighteen million, seven hundred forty-nine thousand, four hundred fifty-nine".