11813885 has 4 divisors (see below), whose sum is σ = 14176668. Its totient is φ = 9451104.

The previous prime is 11813849. The next prime is 11813887. The reversal of 11813885 is 58831811.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9078169 + 2735716 = 3013^2 + 1654^2 .

It is a cyclic number.

It is not a de Polignac number, because 11813885 - 2¹⁸ = 11551741 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 (11813887) 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, 1181384 + ... + 1181393.

It is an arithmetic number, because the mean of its divisors is an integer number (3544167).

Almost surely, 2^11813885 is an apocalyptic number.

It is an amenable number.

11813885 is a deficient number, since it is larger than the sum of its proper divisors (2362783).

11813885 is an equidigital number, since it uses as much as digits as its factorization.

11813885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2362782.

The product of its digits is 7680, while the sum is 35.

The square root of 11813885 is about 3437.1332531632. The cubic root of 11813885 is about 227.7530734438.

The spelling of 11813885 in words is "eleven million, eight hundred thirteen thousand, eight hundred eighty-five".