18923889 has 8 divisors (see below), whose sum is σ = 25431040. Its totient is φ = 12516336.

The previous prime is 18923887. The next prime is 18923893. The reversal of 18923889 is 98832981.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18923889 - 2¹ = 18923887 is a prime.

It is a super-3 number, since 3×18923889³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18923887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24454 + ... + 25215.

It is an arithmetic number, because the mean of its divisors is an integer number (3178880).

Almost surely, 2^18923889 is an apocalyptic number.

It is an amenable number.

18923889 is a deficient number, since it is larger than the sum of its proper divisors (6507151).

18923889 is a wasteful number, since it uses less digits than its factorization.

18923889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49799.

The product of its digits is 248832, while the sum is 48.

The square root of 18923889 is about 4350.1596522427. The cubic root of 18923889 is about 266.4833815187.

The spelling of 18923889 in words is "eighteen million, nine hundred twenty-three thousand, eight hundred eighty-nine".