18136489 has 16 divisors (see below), whose sum is σ = 21823488. Its totient is φ = 14735952.

The previous prime is 18136463. The next prime is 18136493. The reversal of 18136489 is 98463181.

It is not a de Polignac number, because 18136489 - 2⁷ = 18136361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18136409) 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, 20004 + ... + 20890.

It is an arithmetic number, because the mean of its divisors is an integer number (1363968).

Almost surely, 2^18136489 is an apocalyptic number.

It is an amenable number.

18136489 is a deficient number, since it is larger than the sum of its proper divisors (3686999).

18136489 is a wasteful number, since it uses less digits than its factorization.

18136489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044.

The product of its digits is 41472, while the sum is 40.

The square root of 18136489 is about 4258.6956923453. The cubic root of 18136489 is about 262.7348839440.

The spelling of 18136489 in words is "eighteen million, one hundred thirty-six thousand, four hundred eighty-nine".