18021296 has 20 divisors (see below), whose sum is σ = 36121200. Its totient is φ = 8699712.

The previous prime is 18021287. The next prime is 18021301. The reversal of 18021296 is 69212081.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 18956 + ... + 19883.

It is an arithmetic number, because the mean of its divisors is an integer number (1806060).

Almost surely, 2^18021296 is an apocalyptic number.

18021296 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18021296 is an abundant number, since it is smaller than the sum of its proper divisors (18099904).

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

18021296 is a wasteful number, since it uses less digits than its factorization.

18021296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38876 (or 38870 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 18021296 is about 4245.1497028962. The cubic root of 18021296 is about 262.1774529632.

The spelling of 18021296 in words is "eighteen million, twenty-one thousand, two hundred ninety-six".