18878118 has 32 divisors (see below), whose sum is σ = 44157696. Its totient is φ = 5267808.

The previous prime is 18878107. The next prime is 18878129. The reversal of 18878118 is 81187881.

It is an interprime number because it is at equal distance from previous prime (18878107) and next prime (18878129).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 18878118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3421 + ... + 7032.

It is an arithmetic number, because the mean of its divisors is an integer number (1379928).

Almost surely, 2^18878118 is an apocalyptic number.

18878118 is an abundant number, since it is smaller than the sum of its proper divisors (25279578).

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

18878118 is a wasteful number, since it uses less digits than its factorization.

18878118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10508.

The product of its digits is 28672, while the sum is 42.

The square root of 18878118 is about 4344.8956259040. The cubic root of 18878118 is about 266.2683612720.

The spelling of 18878118 in words is "eighteen million, eight hundred seventy-eight thousand, one hundred eighteen".