22301440 has 144 divisors (see below), whose sum is σ = 64753920. Its totient is φ = 7188480.

The previous prime is 22301429. The next prime is 22301441. The reversal of 22301440 is 4410322.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (22301441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170175 + ... + 170305.

It is an arithmetic number, because the mean of its divisors is an integer number (449680).

Almost surely, 2^22301440 is an apocalyptic number.

22301440 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 22301440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32376960).

22301440 is an abundant number, since it is smaller than the sum of its proper divisors (42452480).

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

22301440 is a wasteful number, since it uses less digits than its factorization.

22301440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 164 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 22301440 is about 4722.4400472637. The cubic root of 22301440 is about 281.4778998895.

Adding to 22301440 its reverse (4410322), we get a palindrome (26711762).

The spelling of 22301440 in words is "twenty-two million, three hundred one thousand, four hundred forty".