11389813 has 4 divisors (see below), whose sum is σ = 12059820. Its totient is φ = 10719808.

The previous prime is 11389771. The next prime is 11389831. The reversal of 11389813 is 31898311.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31898311 = 83 ⋅384317.

It can be written as a sum of positive squares in 2 ways, for example, as 10355524 + 1034289 = 3218^2 + 1017^2 .

It is a cyclic number.

It is not a de Polignac number, because 11389813 - 2¹³ = 11381621 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 (11389013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 334978 + ... + 335011.

It is an arithmetic number, because the mean of its divisors is an integer number (3014955).

Almost surely, 2^11389813 is an apocalyptic number.

It is an amenable number.

11389813 is a deficient number, since it is larger than the sum of its proper divisors (670007).

11389813 is an equidigital number, since it uses as much as digits as its factorization.

11389813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670006.

The product of its digits is 5184, while the sum is 34.

The square root of 11389813 is about 3374.8797015597. The cubic root of 11389813 is about 224.9946533709.

The spelling of 11389813 in words is "eleven million, three hundred eighty-nine thousand, eight hundred thirteen".