13222816 has 24 divisors (see below), whose sum is σ = 26179524. Its totient is φ = 6574080.

The previous prime is 13222789. The next prime is 13222823. The reversal of 13222816 is 61822231.

It can be written as a sum of positive squares in 2 ways, for example, as 12931216 + 291600 = 3596^2 + 540^2 .

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, 5106 + ... + 7246.

Almost surely, 2^13222816 is an apocalyptic number.

13222816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13222816 is a deficient number, since it is larger than the sum of its proper divisors (12956708).

13222816 is a wasteful number, since it uses less digits than its factorization.

13222816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2344 (or 2336 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 13222816 is about 3636.3190179081. The cubic root of 13222816 is about 236.4692378048.

The spelling of 13222816 in words is "thirteen million, two hundred twenty-two thousand, eight hundred sixteen".