13220992 has 16 divisors (see below), whose sum is σ = 26338950. Its totient is φ = 6610432.

The previous prime is 13220989. The next prime is 13220993. The reversal of 13220992 is 29902231.

It can be written as a sum of positive squares in only one way, i.e., 13133376 + 87616 = 3624^2 + 296^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 13220992.

It is not an unprimeable number, because it can be changed into a prime (13220993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51517 + ... + 51772.

Almost surely, 2^13220992 is an apocalyptic number.

It is an amenable number.

13220992 is a deficient number, since it is larger than the sum of its proper divisors (13117958).

13220992 is an equidigital number, since it uses as much as digits as its factorization.

13220992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103303 (or 103291 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 13220992 is about 3636.0682061810. The cubic root of 13220992 is about 236.4583641824.

The spelling of 13220992 in words is "thirteen million, two hundred twenty thousand, nine hundred ninety-two".