18502489 has 2 divisors, whose sum is σ = 18502490. Its totient is φ = 18502488.

The previous prime is 18502487. The next prime is 18502499. The reversal of 18502489 is 98420581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18421264 + 81225 = 4292^2 + 285^2 .

It is a cyclic number.

It is not a de Polignac number, because 18502489 - 2¹ = 18502487 is a prime.

Together with 18502487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18502481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9251244 + 9251245.

It is an arithmetic number, because the mean of its divisors is an integer number (9251245).

Almost surely, 2^18502489 is an apocalyptic number.

It is an amenable number.

18502489 is a deficient number, since it is larger than the sum of its proper divisors (1).

18502489 is an equidigital number, since it uses as much as digits as its factorization.

18502489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 18502489 is about 4301.4519641628. The cubic root of 18502489 is about 264.4904841351.

The spelling of 18502489 in words is "eighteen million, five hundred two thousand, four hundred eighty-nine".