18922272 has 48 divisors (see below), whose sum is σ = 50621760. Its totient is φ = 6186752.

The previous prime is 18922243. The next prime is 18922273. The reversal of 18922272 is 27222981.

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18922273) 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, 3229 + ... + 6947.

It is an arithmetic number, because the mean of its divisors is an integer number (1054620).

Almost surely, 2^18922272 is an apocalyptic number.

18922272 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 18922272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25310880).

18922272 is an abundant number, since it is smaller than the sum of its proper divisors (31699488).

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

18922272 is a wasteful number, since it uses less digits than its factorization.

18922272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3785 (or 3777 counting only the distinct ones).

The product of its digits is 8064, while the sum is 33.

The square root of 18922272 is about 4349.9737930245. The cubic root of 18922272 is about 266.4757911849.

The spelling of 18922272 in words is "eighteen million, nine hundred twenty-two thousand, two hundred seventy-two".