18781794 has 40 divisors (see below), whose sum is σ = 42375168. Its totient is φ = 6217560.

The previous prime is 18781793. The next prime is 18781801. The reversal of 18781794 is 49718781.

It is not an unprimeable number, because it can be changed into a prime (18781793) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 30639 + ... + 31245.

Almost surely, 2^18781794 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18781794, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21187584).

18781794 is an abundant number, since it is smaller than the sum of its proper divisors (23593374).

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

18781794 is a wasteful number, since it uses less digits than its factorization.

18781794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812 (or 803 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The square root of 18781794 is about 4333.7967188137. The cubic root of 18781794 is about 265.8147182409.

The spelling of 18781794 in words is "eighteen million, seven hundred eighty-one thousand, seven hundred ninety-four".