18490878 has 48 divisors (see below), whose sum is σ = 46272096. Its totient is φ = 5227200.

The previous prime is 18490847. The next prime is 18490891. The reversal of 18490878 is 87809481.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12000 + ... + 13452.

It is an arithmetic number, because the mean of its divisors is an integer number (964002).

Almost surely, 2^18490878 is an apocalyptic number.

18490878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18490878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23136048).

18490878 is an abundant number, since it is smaller than the sum of its proper divisors (27781218).

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

18490878 is a wasteful number, since it uses less digits than its factorization.

18490878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1569 (or 1566 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 18490878 is about 4300.1020918113. The cubic root of 18490878 is about 264.4351466862.

The spelling of 18490878 in words is "eighteen million, four hundred ninety thousand, eight hundred seventy-eight".