11817813 has 8 divisors (see below), whose sum is σ = 18008128. Its totient is φ = 6753024.

The previous prime is 11817811. The next prime is 11817823. The reversal of 11817813 is 31871811.

It is a happy number.

11817813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 11817813 - 2¹ = 11817811 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 (11817811) 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, 281356 + ... + 281397.

It is an arithmetic number, because the mean of its divisors is an integer number (2251016).

Almost surely, 2^11817813 is an apocalyptic number.

It is an amenable number.

11817813 is a deficient number, since it is larger than the sum of its proper divisors (6190315).

11817813 is an equidigital number, since it uses as much as digits as its factorization.

11817813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562763.

The product of its digits is 1344, while the sum is 30.

The square root of 11817813 is about 3437.7046120922. The cubic root of 11817813 is about 227.7783125288.

The spelling of 11817813 in words is "eleven million, eight hundred seventeen thousand, eight hundred thirteen".