11399813 has 4 divisors (see below), whose sum is σ = 11792940. Its totient is φ = 11006688.

The previous prime is 11399797. The next prime is 11399827. The reversal of 11399813 is 31899311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31899311 = 463 ⋅68897.

It can be written as a sum of positive squares in 2 ways, for example, as 8988004 + 2411809 = 2998^2 + 1553^2 .

It is a cyclic number.

It is not a de Polignac number, because 11399813 - 2⁴ = 11399797 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 (11399833) 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, 196520 + ... + 196577.

It is an arithmetic number, because the mean of its divisors is an integer number (2948235).

Almost surely, 2^11399813 is an apocalyptic number.

It is an amenable number.

11399813 is a deficient number, since it is larger than the sum of its proper divisors (393127).

11399813 is an equidigital number, since it uses as much as digits as its factorization.

11399813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393126.

The product of its digits is 5832, while the sum is 35.

The square root of 11399813 is about 3376.3609108032. The cubic root of 11399813 is about 225.0604808604.

The spelling of 11399813 in words is "eleven million, three hundred ninety-nine thousand, eight hundred thirteen".