22401240 has 128 divisors (see below), whose sum is σ = 72576000. Its totient is φ = 5511168.

The previous prime is 22401229. The next prime is 22401259. The reversal of 22401240 is 4210422.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 161091 + ... + 161229.

It is an arithmetic number, because the mean of its divisors is an integer number (567000).

Almost surely, 2^22401240 is an apocalyptic number.

22401240 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 22401240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36288000).

22401240 is an abundant number, since it is smaller than the sum of its proper divisors (50174760).

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

22401240 is a wasteful number, since it uses less digits than its factorization.

22401240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 245 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 22401240 is about 4732.9948235763. The cubic root of 22401240 is about 281.8971507643.

Adding to 22401240 its reverse (4210422), we get a palindrome (26611662).

The spelling of 22401240 in words is "twenty-two million, four hundred one thousand, two hundred forty".