18740489 has 2 divisors, whose sum is σ = 18740490. Its totient is φ = 18740488.

The previous prime is 18740483. The next prime is 18740531. The reversal of 18740489 is 98404781.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18421264 + 319225 = 4292^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 18740489 - 2⁴ = 18740473 is a prime.

It is not a weakly prime, because it can be changed into another prime (18740483) 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, 9370244 + 9370245.

It is an arithmetic number, because the mean of its divisors is an integer number (9370245).

Almost surely, 2^18740489 is an apocalyptic number.

It is an amenable number.

18740489 is a deficient number, since it is larger than the sum of its proper divisors (1).

18740489 is an equidigital number, since it uses as much as digits as its factorization.

18740489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 18740489 is about 4329.0286439339. The cubic root of 18740489 is about 265.6197149398.

The spelling of 18740489 in words is "eighteen million, seven hundred forty thousand, four hundred eighty-nine".