22343440 has 80 divisors (see below), whose sum is σ = 62888832. Its totient is φ = 7206912.

The previous prime is 22343407. The next prime is 22343443. The reversal of 22343440 is 4434322.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×22343440² = 998458622067200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22343443) 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, 8347 + ... + 10693.

Almost surely, 2^22343440 is an apocalyptic number.

22343440 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 22343440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31444416).

22343440 is an abundant number, since it is smaller than the sum of its proper divisors (40545392).

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

22343440 is a wasteful number, since it uses less digits than its factorization.

22343440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384 (or 2378 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 22.

The square root of 22343440 is about 4726.8848092586. The cubic root of 22343440 is about 281.6544902516.

Adding to 22343440 its reverse (4434322), we get a palindrome (26777762).

The spelling of 22343440 in words is "twenty-two million, three hundred forty-three thousand, four hundred forty".