18738689 has 4 divisors (see below), whose sum is σ = 18767700. Its totient is φ = 18709680.

The previous prime is 18738679. The next prime is 18738701. The reversal of 18738689 is 98683781.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6801664 + 11937025 = 2608^2 + 3455^2 .

It is a cyclic number.

It is not a de Polignac number, because 18738689 - 2⁴ = 18738673 is a prime.

It is a super-2 number, since 2×18738689² = 702276930877442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18738619) 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, 13514 + ... + 14835.

It is an arithmetic number, because the mean of its divisors is an integer number (4691925).

Almost surely, 2^18738689 is an apocalyptic number.

It is an amenable number.

18738689 is a deficient number, since it is larger than the sum of its proper divisors (29011).

18738689 is an equidigital number, since it uses as much as digits as its factorization.

18738689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29010.

The product of its digits is 580608, while the sum is 50.

The square root of 18738689 is about 4328.8207401093. The cubic root of 18738689 is about 265.6112105229.

The spelling of 18738689 in words is "eighteen million, seven hundred thirty-eight thousand, six hundred eighty-nine".