22463440 has 40 divisors (see below), whose sum is σ = 53646120. Its totient is φ = 8741376.

The previous prime is 22463423. The next prime is 22463447. The reversal of 22463440 is 4436422.

It can be written as a sum of positive squares in 4 ways, for example, as 1008016 + 21455424 = 1004^2 + 4632^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×22463440² = 1009212273267200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22463447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 835 + ... + 6754.

It is an arithmetic number, because the mean of its divisors is an integer number (1341153).

Almost surely, 2^22463440 is an apocalyptic number.

22463440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22463440 is an abundant number, since it is smaller than the sum of its proper divisors (31182680).

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

22463440 is a wasteful number, since it uses less digits than its factorization.

22463440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7639 (or 7633 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 22463440 is about 4739.5611611203. The cubic root of 22463440 is about 282.1578178713.

Adding to 22463440 its reverse (4436422), we get a palindrome (26899862).

The spelling of 22463440 in words is "twenty-two million, four hundred sixty-three thousand, four hundred forty".