22461440 has 88 divisors (see below), whose sum is σ = 55711152. Its totient is φ = 8683520.

The previous prime is 22461431. The next prime is 22461463. The reversal of 22461440 is 4416422.

It is a zygodrome in base 4.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209867 + ... + 209973.

Almost surely, 2^22461440 is an apocalyptic number.

22461440 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 22461440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27855576).

22461440 is an abundant number, since it is smaller than the sum of its proper divisors (33249712).

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

22461440 is a wasteful number, since it uses less digits than its factorization.

22461440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 22461440 is about 4739.3501664258. The cubic root of 22461440 is about 282.1494437846.

Adding to 22461440 its reverse (4416422), we get a palindrome (26877862).

The spelling of 22461440 in words is "twenty-two million, four hundred sixty-one thousand, four hundred forty".