18869918 has 8 divisors (see below), whose sum is σ = 28327800. Its totient is φ = 9427320.

The previous prime is 18869891. The next prime is 18869927. The reversal of 18869918 is 81996881.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53 + ... + 6143.

It is an arithmetic number, because the mean of its divisors is an integer number (3540975).

Almost surely, 2^18869918 is an apocalyptic number.

18869918 is a deficient number, since it is larger than the sum of its proper divisors (9457882).

18869918 is a wasteful number, since it uses less digits than its factorization.

18869918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7642.

The product of its digits is 248832, while the sum is 50.

The square root of 18869918 is about 4343.9518873947. The cubic root of 18869918 is about 266.2298031070.

The spelling of 18869918 in words is "eighteen million, eight hundred sixty-nine thousand, nine hundred eighteen".