13220957 has 8 divisors (see below), whose sum is σ = 13626360. Its totient is φ = 12821760.

The previous prime is 13220953. The next prime is 13220971. The reversal of 13220957 is 75902231.

It can be written as a sum of positive squares in 4 ways, for example, as 682276 + 12538681 = 826^2 + 3541^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13220957 - 2² = 13220953 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220953) 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, 2969 + ... + 5937.

It is an arithmetic number, because the mean of its divisors is an integer number (1703295).

Almost surely, 2^13220957 is an apocalyptic number.

13220957 is the 2969-th pentagonal number.

It is an amenable number.

13220957 is a deficient number, since it is larger than the sum of its proper divisors (405403).

13220957 is an equidigital number, since it uses as much as digits as its factorization.

13220957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3103.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 13220957 is about 3636.0633932868. The cubic root of 13220957 is about 236.4581555231.

The spelling of 13220957 in words is "thirteen million, two hundred twenty thousand, nine hundred fifty-seven".