18921792 has 56 divisors (see below), whose sum is σ = 50495200. Its totient is φ = 6253056.

The previous prime is 18921781. The next prime is 18921817. The reversal of 18921792 is 29712981.

It is a self number, because there is not a number n which added to its sum of digits gives 18921792.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26334 + ... + 27042.

It is an arithmetic number, because the mean of its divisors is an integer number (901700).

Almost surely, 2^18921792 is an apocalyptic number.

18921792 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18921792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25247600).

18921792 is an abundant number, since it is smaller than the sum of its proper divisors (31573408).

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

18921792 is a wasteful number, since it uses less digits than its factorization.

18921792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863 (or 853 counting only the distinct ones).

The product of its digits is 18144, while the sum is 39.

The square root of 18921792 is about 4349.9186199284. The cubic root of 18921792 is about 266.4735379414.

The spelling of 18921792 in words is "eighteen million, nine hundred twenty-one thousand, seven hundred ninety-two".