18743889 has 8 divisors (see below), whose sum is σ = 25853760. Its totient is φ = 12064976.

The previous prime is 18743869. The next prime is 18743891. The reversal of 18743889 is 98834781.

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

It is a cyclic number.

It is not a de Polignac number, because 18743889 - 2⁹ = 18743377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18743839) 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, 107637 + ... + 107810.

It is an arithmetic number, because the mean of its divisors is an integer number (3231720).

Almost surely, 2^18743889 is an apocalyptic number.

It is an amenable number.

18743889 is a deficient number, since it is larger than the sum of its proper divisors (7109871).

18743889 is a wasteful number, since it uses less digits than its factorization.

18743889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215479.

The product of its digits is 387072, while the sum is 48.

The square root of 18743889 is about 4329.4213239185. The cubic root of 18743889 is about 265.6357773528.

The spelling of 18743889 in words is "eighteen million, seven hundred forty-three thousand, eight hundred eighty-nine".