13222640 has 40 divisors (see below), whose sum is σ = 30935520. Its totient is φ = 5255936.

The previous prime is 13222639. The next prime is 13222661. The reversal of 13222640 is 4622231.

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

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15341 + ... + 16179.

It is an arithmetic number, because the mean of its divisors is an integer number (773388).

Almost surely, 2^13222640 is an apocalyptic number.

13222640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13222640 is an abundant number, since it is smaller than the sum of its proper divisors (17712880).

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

13222640 is a wasteful number, since it uses less digits than its factorization.

13222640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049 (or 1043 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 13222640 is about 3636.2948175306. The cubic root of 13222640 is about 236.4681886392.

Adding to 13222640 its reverse (4622231), we get a palindrome (17844871).

The spelling of 13222640 in words is "thirteen million, two hundred twenty-two thousand, six hundred forty".