18978876 has 144 divisors (see below), whose sum is σ = 58968000. Its totient is φ = 5136768.

The previous prime is 18978871. The next prime is 18978893. The reversal of 18978876 is 67887981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18978871) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 358066 + ... + 358118.

It is an arithmetic number, because the mean of its divisors is an integer number (409500).

Almost surely, 2^18978876 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18978876, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29484000).

18978876 is an abundant number, since it is smaller than the sum of its proper divisors (39989124).

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

18978876 is a wasteful number, since it uses less digits than its factorization.

18978876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 94 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 54.

The square root of 18978876 is about 4356.4751806937. The cubic root of 18978876 is about 266.7412381724.

The spelling of 18978876 in words is "eighteen million, nine hundred seventy-eight thousand, eight hundred seventy-six".