11813905 has 4 divisors (see below), whose sum is σ = 14176692. Its totient is φ = 9451120.

The previous prime is 11813899. The next prime is 11813917. The reversal of 11813905 is 50931811.

11813905 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50931811 = 7 ⋅7275973.

It can be written as a sum of positive squares in 2 ways, for example, as 1567504 + 10246401 = 1252^2 + 3201^2 .

It is not a de Polignac number, because 11813905 - 2¹³ = 11805713 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1181386 + ... + 1181395.

It is an arithmetic number, because the mean of its divisors is an integer number (3544173).

Almost surely, 2^11813905 is an apocalyptic number.

It is an amenable number.

11813905 is a deficient number, since it is larger than the sum of its proper divisors (2362787).

11813905 is an equidigital number, since it uses as much as digits as its factorization.

11813905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2362786.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 11813905 is about 3437.1361625632. The cubic root of 11813905 is about 227.7532019666.

The spelling of 11813905 in words is "eleven million, eight hundred thirteen thousand, nine hundred five".