18994878 has 64 divisors (see below), whose sum is σ = 49827840. Its totient is φ = 5248800.

The previous prime is 18994861. The next prime is 18994883. The reversal of 18994878 is 87849981.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10908 + ... + 12528.

It is an arithmetic number, because the mean of its divisors is an integer number (778560).

Almost surely, 2^18994878 is an apocalyptic number.

18994878 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 18994878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24913920).

18994878 is an abundant number, since it is smaller than the sum of its proper divisors (30832962).

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

18994878 is a wasteful number, since it uses less digits than its factorization.

18994878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670 (or 1664 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The square root of 18994878 is about 4358.3113702442. The cubic root of 18994878 is about 266.8161845536.

The spelling of 18994878 in words is "eighteen million, nine hundred ninety-four thousand, eight hundred seventy-eight".