1306813 has 4 divisors (see below), whose sum is σ = 1337248. Its totient is φ = 1276380.

The previous prime is 1306777. The next prime is 1306817. The reversal of 1306813 is 3186031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3186031 = 859 ⋅3709.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1306813 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 (1306817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15153 + ... + 15238.

It is an arithmetic number, because the mean of its divisors is an integer number (334312).

2^1306813 is an apocalyptic number.

It is an amenable number.

1306813 is a deficient number, since it is larger than the sum of its proper divisors (30435).

1306813 is an equidigital number, since it uses as much as digits as its factorization.

1306813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30434.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1306813 is about 1143.1592190067. The cubic root of 1306813 is about 109.3296141490.

The spelling of 1306813 in words is "one million, three hundred six thousand, eight hundred thirteen".