18713389 has 4 divisors (see below), whose sum is σ = 18760924. Its totient is φ = 18665856.

The previous prime is 18713353. The next prime is 18713393. The reversal of 18713389 is 98331781.

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 4235364 + 14478025 = 2058^2 + 3805^2 .

It is a cyclic number.

It is not a de Polignac number, because 18713389 - 2⁹ = 18712877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18713339) 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 3 ways as a sum of consecutive naturals, for example, 23172 + ... + 23965.

It is an arithmetic number, because the mean of its divisors is an integer number (4690231).

Almost surely, 2^18713389 is an apocalyptic number.

It is an amenable number.

18713389 is a deficient number, since it is larger than the sum of its proper divisors (47535).

18713389 is an equidigital number, since it uses as much as digits as its factorization.

18713389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47534.

The product of its digits is 36288, while the sum is 40.

The square root of 18713389 is about 4325.8974791366. The cubic root of 18713389 is about 265.4916185527.

The spelling of 18713389 in words is "eighteen million, seven hundred thirteen thousand, three hundred eighty-nine".