22386640 has 40 divisors (see below), whose sum is σ = 52315848. Its totient is φ = 8908800.

The previous prime is 22386631. The next prime is 22386641. The reversal of 22386640 is 4668322.

It can be written as a sum of positive squares in 4 ways, for example, as 968256 + 21418384 = 984^2 + 4628^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22386641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18040 + ... + 19240.

Almost surely, 2^22386640 is an apocalyptic number.

22386640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22386640 is an abundant number, since it is smaller than the sum of its proper divisors (29929208).

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

22386640 is a wasteful number, since it uses less digits than its factorization.

22386640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1447 (or 1441 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 22386640 is about 4731.4522083606. The cubic root of 22386640 is about 281.8358953329.

The spelling of 22386640 in words is "twenty-two million, three hundred eighty-six thousand, six hundred forty".