18689489 has 16 divisors (see below), whose sum is σ = 23399040. Its totient is φ = 14536656.

The previous prime is 18689441. The next prime is 18689491. The reversal of 18689489 is 98498681.

It is not a de Polignac number, because 18689489 - 2⁸ = 18689233 is a prime.

It is a super-2 number, since 2×18689489² = 698593998162242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18689489.

It is not an unprimeable number, because it can be changed into a prime (18689189) 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 in 15 ways as a sum of consecutive naturals, for example, 316742 + ... + 316800.

It is an arithmetic number, because the mean of its divisors is an integer number (1462440).

Almost surely, 2^18689489 is an apocalyptic number.

It is an amenable number.

18689489 is a deficient number, since it is larger than the sum of its proper divisors (4709551).

18689489 is an frugal number, since it uses more digits than its factorization.

18689489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197 (or 79 counting only the distinct ones).

The product of its digits is 995328, while the sum is 53.

The square root of 18689489 is about 4323.1341640065. The cubic root of 18689489 is about 265.3785452712.

The spelling of 18689489 in words is "eighteen million, six hundred eighty-nine thousand, four hundred eighty-nine".