18784974 has 64 divisors (see below), whose sum is σ = 43513344. Its totient is φ = 5360256.

The previous prime is 18784973. The next prime is 18784993. The reversal of 18784974 is 47948781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18784973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66237 + ... + 66519.

It is an arithmetic number, because the mean of its divisors is an integer number (679896).

Almost surely, 2^18784974 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18784974, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21756672).

18784974 is an abundant number, since it is smaller than the sum of its proper divisors (24728370).

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

18784974 is a wasteful number, since it uses less digits than its factorization.

18784974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361.

The product of its digits is 451584, while the sum is 48.

The square root of 18784974 is about 4334.1635871296. The cubic root of 18784974 is about 265.8297193478.

The spelling of 18784974 in words is "eighteen million, seven hundred eighty-four thousand, nine hundred seventy-four".