18968389 has 4 divisors (see below), whose sum is σ = 20692800. Its totient is φ = 17243980.

The previous prime is 18968381. The next prime is 18968419. The reversal of 18968389 is 98386981.

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 18968389 - 2³ = 18968381 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 (18968381) 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, 862189 + ... + 862210.

It is an arithmetic number, because the mean of its divisors is an integer number (5173200).

Almost surely, 2^18968389 is an apocalyptic number.

It is an amenable number.

18968389 is a deficient number, since it is larger than the sum of its proper divisors (1724411).

18968389 is a wasteful number, since it uses less digits than its factorization.

18968389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724410.

The product of its digits is 746496, while the sum is 52.

The square root of 18968389 is about 4355.2714037130. The cubic root of 18968389 is about 266.6920987897.

The spelling of 18968389 in words is "eighteen million, nine hundred sixty-eight thousand, three hundred eighty-nine".