22491300 has 144 divisors (see below), whose sum is σ = 71939840. Its totient is φ = 5391360.

The previous prime is 22491283. The next prime is 22491311. The reversal of 22491300 is 319422.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 284661 + ... + 284739.

Almost surely, 2^22491300 is an apocalyptic number.

22491300 is a gapful number since it is divisible by the number (20) 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 22491300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35969920).

22491300 is an abundant number, since it is smaller than the sum of its proper divisors (49448540).

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

22491300 is a wasteful number, since it uses less digits than its factorization.

22491300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 22491300 is about 4742.4993410648. The cubic root of 22491300 is about 282.2744172470.

It can be divided in two parts, 22491 and 300, that added together give a triangular number (22791 = T₂₁₃).

The spelling of 22491300 in words is "twenty-two million, four hundred ninety-one thousand, three hundred".