18496989 has 12 divisors (see below), whose sum is σ = 30534816. Its totient is φ = 10569672.

The previous prime is 18496979. The next prime is 18496999. The reversal of 18496989 is 98969481.

It is an interprime number because it is at equal distance from previous prime (18496979) and next prime (18496999).

It is not a de Polignac number, because 18496989 - 2⁸ = 18496733 is a prime.

It is a super-2 number, since 2×18496989² = 684277204132242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18496909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146739 + ... + 146864.

It is an arithmetic number, because the mean of its divisors is an integer number (2544568).

Almost surely, 2^18496989 is an apocalyptic number.

It is an amenable number.

18496989 is a deficient number, since it is larger than the sum of its proper divisors (12037827).

18496989 is a wasteful number, since it uses less digits than its factorization.

18496989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293616 (or 293613 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 18496989 is about 4300.8125976378. The cubic root of 18496989 is about 264.4642742952.

The spelling of 18496989 in words is "eighteen million, four hundred ninety-six thousand, nine hundred eighty-nine".