22299440 has 20 divisors (see below), whose sum is σ = 51846384. Its totient is φ = 8919744.

The previous prime is 22299437. The next prime is 22299451. The reversal of 22299440 is 4499222.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 22299397 and 22299406.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139292 + ... + 139451.

Almost surely, 2^22299440 is an apocalyptic number.

22299440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22299440 is an abundant number, since it is smaller than the sum of its proper divisors (29546944).

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

22299440 is a wasteful number, since it uses less digits than its factorization.

22299440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278756 (or 278750 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 22299440 is about 4722.2282875778. The cubic root of 22299440 is about 281.4694852964.

The spelling of 22299440 in words is "twenty-two million, two hundred ninety-nine thousand, four hundred forty".