18221896 has 32 divisors (see below), whose sum is σ = 42598080. Its totient is φ = 7099200.

The previous prime is 18221887. The next prime is 18221897. The reversal of 18221896 is 69812281.

It is not an unprimeable number, because it can be changed into a prime (18221897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14175 + ... + 15406.

It is an arithmetic number, because the mean of its divisors is an integer number (1331190).

Almost surely, 2^18221896 is an apocalyptic number.

It is an amenable number.

18221896 is an abundant number, since it is smaller than the sum of its proper divisors (24376184).

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

18221896 is a wasteful number, since it uses less digits than its factorization.

18221896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29605 (or 29601 counting only the distinct ones).

The product of its digits is 13824, while the sum is 37.

The square root of 18221896 is about 4268.7112809371. The cubic root of 18221896 is about 263.1466554245.

The spelling of 18221896 in words is "eighteen million, two hundred twenty-one thousand, eight hundred ninety-six".