18499489 has 2 divisors, whose sum is σ = 18499490. Its totient is φ = 18499488.

The previous prime is 18499447. The next prime is 18499493. The reversal of 18499489 is 98499481.

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., 10291264 + 8208225 = 3208^2 + 2865^2 .

It is an emirp because it is prime and its reverse (98499481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18499489 - 2¹¹ = 18497441 is a prime.

It is a super-2 number, since 2×18499489² = 684462186522242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18490489) 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, 9249744 + 9249745.

It is an arithmetic number, because the mean of its divisors is an integer number (9249745).

Almost surely, 2^18499489 is an apocalyptic number.

It is an amenable number.

18499489 is a deficient number, since it is larger than the sum of its proper divisors (1).

18499489 is an equidigital number, since it uses as much as digits as its factorization.

18499489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 52.

The square root of 18499489 is about 4301.1032305677. The cubic root of 18499489 is about 264.4761885028.

The spelling of 18499489 in words is "eighteen million, four hundred ninety-nine thousand, four hundred eighty-nine".