18943918 has 8 divisors (see below), whose sum is σ = 32475312. Its totient is φ = 8118816.

The previous prime is 18943913. The next prime is 18943921. The reversal of 18943918 is 81934981.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18943913) 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, 676555 + ... + 676582.

It is an arithmetic number, because the mean of its divisors is an integer number (4059414).

Almost surely, 2^18943918 is an apocalyptic number.

18943918 is a deficient number, since it is larger than the sum of its proper divisors (13531394).

18943918 is a wasteful number, since it uses less digits than its factorization.

18943918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353146.

The product of its digits is 62208, while the sum is 43.

The square root of 18943918 is about 4352.4611428478. The cubic root of 18943918 is about 266.5773634997.

The spelling of 18943918 in words is "eighteen million, nine hundred forty-three thousand, nine hundred eighteen".