18736489 has 4 divisors (see below), whose sum is σ = 19722640. Its totient is φ = 17750340.

The previous prime is 18736481. The next prime is 18736561. The reversal of 18736489 is 98463781.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18736489 - 2³ = 18736481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18736481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 493047 + ... + 493084.

It is an arithmetic number, because the mean of its divisors is an integer number (4930660).

Almost surely, 2^18736489 is an apocalyptic number.

18736489 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18736489 is a deficient number, since it is larger than the sum of its proper divisors (986151).

18736489 is an equidigital number, since it uses as much as digits as its factorization.

18736489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986150.

The product of its digits is 290304, while the sum is 46.

The square root of 18736489 is about 4328.5666218738. The cubic root of 18736489 is about 265.6008154959.

The spelling of 18736489 in words is "eighteen million, seven hundred thirty-six thousand, four hundred eighty-nine".