18573389 has 4 divisors (see below), whose sum is σ = 18600960. Its totient is φ = 18545820.

The previous prime is 18573383. The next prime is 18573391. The reversal of 18573389 is 98337581.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98337581 = 23 ⋅4275547.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18573389 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 (18573383) 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, 12749 + ... + 14130.

It is an arithmetic number, because the mean of its divisors is an integer number (4650240).

Almost surely, 2^18573389 is an apocalyptic number.

It is an amenable number.

18573389 is a deficient number, since it is larger than the sum of its proper divisors (27571).

18573389 is an equidigital number, since it uses as much as digits as its factorization.

18573389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27570.

The product of its digits is 181440, while the sum is 44.

The square root of 18573389 is about 4309.6854873645. The cubic root of 18573389 is about 264.8278887166.

The spelling of 18573389 in words is "eighteen million, five hundred seventy-three thousand, three hundred eighty-nine".