22440000 has 280 divisors, whose sum is σ = 85697568. Its totient is φ = 5120000.

The previous prime is 22439999. The next prime is 22440031. The reversal of 22440000 is 4422.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1319992 + ... + 1320008.

Almost surely, 2^22440000 is an apocalyptic number.

22440000 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 22440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42848784).

22440000 is an abundant number, since it is smaller than the sum of its proper divisors (63257568).

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

22440000 is a wasteful number, since it uses less digits than its factorization.

22440000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 22440000 is about 4737.0877129308. The cubic root of 22440000 is about 282.0596423318.

Adding to 22440000 its reverse (4422), we get a palindrome (22444422).

The spelling of 22440000 in words is "twenty-two million, four hundred forty thousand".