18843918 has 8 divisors (see below), whose sum is σ = 37687848. Its totient is φ = 6281304.

The previous prime is 18843911. The next prime is 18843919. The reversal of 18843918 is 81934881.

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

18843918 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 18843918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18843911) 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, 1570321 + ... + 1570332.

It is an arithmetic number, because the mean of its divisors is an integer number (4710981).

Almost surely, 2^18843918 is an apocalyptic number.

18843918 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18843918 is a wasteful number, since it uses less digits than its factorization.

18843918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3140658.

The product of its digits is 55296, while the sum is 42.

The square root of 18843918 is about 4340.9581891559. The cubic root of 18843918 is about 266.1074716007.

The spelling of 18843918 in words is "eighteen million, eight hundred forty-three thousand, nine hundred eighteen".