18481878 has 16 divisors (see below), whose sum is σ = 41070960. Its totient is φ = 6160608.

The previous prime is 18481871. The next prime is 18481891. The reversal of 18481878 is 87818481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18481871) 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, 171075 + ... + 171182.

It is an arithmetic number, because the mean of its divisors is an integer number (2566935).

Almost surely, 2^18481878 is an apocalyptic number.

18481878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18481878 is an abundant number, since it is smaller than the sum of its proper divisors (22589082).

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

18481878 is a wasteful number, since it uses less digits than its factorization.

18481878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342268 (or 342262 counting only the distinct ones).

The product of its digits is 114688, while the sum is 45.

The square root of 18481878 is about 4299.0554776602. The cubic root of 18481878 is about 264.3922371941.

The spelling of 18481878 in words is "eighteen million, four hundred eighty-one thousand, eight hundred seventy-eight".