13222840 has 32 divisors (see below), whose sum is σ = 30780000. Its totient is φ = 5106304.

The previous prime is 13222823. The next prime is 13222843. The reversal of 13222840 is 4822231.

13222840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13222843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4540 + ... + 6859.

It is an arithmetic number, because the mean of its divisors is an integer number (961875).

Almost surely, 2^13222840 is an apocalyptic number.

13222840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13222840 is an abundant number, since it is smaller than the sum of its proper divisors (17557160).

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

13222840 is a wasteful number, since it uses less digits than its factorization.

13222840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11439 (or 11435 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 13222840 is about 3636.3223179471. The cubic root of 13222840 is about 236.4693808721.

The spelling of 13222840 in words is "thirteen million, two hundred twenty-two thousand, eight hundred forty".