18490789 has 2 divisors, whose sum is σ = 18490790. Its totient is φ = 18490788.

The previous prime is 18490763. The next prime is 18490807. The reversal of 18490789 is 98709481.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12888100 + 5602689 = 3590^2 + 2367^2 .

It is a cyclic number.

It is not a de Polignac number, because 18490789 - 2⁵ = 18490757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18490709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9245394 + 9245395.

It is an arithmetic number, because the mean of its divisors is an integer number (9245395).

Almost surely, 2^18490789 is an apocalyptic number.

It is an amenable number.

18490789 is a deficient number, since it is larger than the sum of its proper divisors (1).

18490789 is an equidigital number, since it uses as much as digits as its factorization.

18490789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 18490789 is about 4300.0917432073. The cubic root of 18490789 is about 264.4347224271.

The spelling of 18490789 in words is "eighteen million, four hundred ninety thousand, seven hundred eighty-nine".