13213705 has 8 divisors (see below), whose sum is σ = 16403400. Its totient is φ = 10206336.

The previous prime is 13213703. The next prime is 13213747. The reversal of 13213705 is 50731231.

It can be written as a sum of positive squares in 4 ways, for example, as 1290496 + 11923209 = 1136^2 + 3453^2 .

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 13213705 - 2¹ = 13213703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13213703) 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, 45420 + ... + 45709.

It is an arithmetic number, because the mean of its divisors is an integer number (2050425).

Almost surely, 2^13213705 is an apocalyptic number.

It is an amenable number.

13213705 is a deficient number, since it is larger than the sum of its proper divisors (3189695).

13213705 is an equidigital number, since it uses as much as digits as its factorization.

13213705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91163.

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 13213705 is about 3635.0660241597. The cubic root of 13213705 is about 236.4149133641.

Adding to 13213705 its reverse (50731231), we get a palindrome (63944936).

The spelling of 13213705 in words is "thirteen million, two hundred thirteen thousand, seven hundred five".