18978324 has 48 divisors (see below), whose sum is σ = 48416256. Its totient is φ = 5760000.

The previous prime is 18978313. The next prime is 18978329. The reversal of 18978324 is 42387981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18978329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4824 + ... + 7824.

It is an arithmetic number, because the mean of its divisors is an integer number (1008672).

Almost surely, 2^18978324 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 18978324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24208128).

18978324 is an abundant number, since it is smaller than the sum of its proper divisors (29437932).

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

18978324 is a wasteful number, since it uses less digits than its factorization.

18978324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3056 (or 3054 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The square root of 18978324 is about 4356.4118262625. The cubic root of 18978324 is about 266.7386520939.

The spelling of 18978324 in words is "eighteen million, nine hundred seventy-eight thousand, three hundred twenty-four".