22439840 has 24 divisors (see below), whose sum is σ = 53014500. Its totient is φ = 8975872.

The previous prime is 22439831. The next prime is 22439843. The reversal of 22439840 is 4893422.

It can be written as a sum of positive squares in 2 ways, for example, as 22165264 + 274576 = 4708^2 + 524^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 22439797 and 22439806.

It is not an unprimeable number, because it can be changed into a prime (22439843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69965 + ... + 70284.

Almost surely, 2^22439840 is an apocalyptic number.

22439840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22439840 is an abundant number, since it is smaller than the sum of its proper divisors (30574660).

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

22439840 is a wasteful number, since it uses less digits than its factorization.

22439840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140264 (or 140256 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 22439840 is about 4737.0708248875. The cubic root of 22439840 is about 282.0589719568.

The spelling of 22439840 in words is "twenty-two million, four hundred thirty-nine thousand, eight hundred forty".