22312440 has 48 divisors (see below), whose sum is σ = 72516600. Its totient is φ = 5949888.

The previous prime is 22312421. The next prime is 22312469. The reversal of 22312440 is 4421322.

22312440 is a `hidden beast` number, since 223 + 1 + 2 + 440 = 666.

It is a super-3 number, since 3×22312440³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30630 + ... + 31349.

Almost surely, 2^22312440 is an apocalyptic number.

22312440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22312440 is an abundant number, since it is smaller than the sum of its proper divisors (50204160).

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

22312440 is a wasteful number, since it uses less digits than its factorization.

22312440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61996 (or 61989 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 22312440 is about 4723.6045558450. The cubic root of 22312440 is about 281.5241711612.

Adding to 22312440 its reverse (4421322), we get a palindrome (26733762).

The spelling of 22312440 in words is "twenty-two million, three hundred twelve thousand, four hundred forty".