11681405 has 4 divisors (see below), whose sum is σ = 14017692. Its totient is φ = 9345120.

The previous prime is 11681399. The next prime is 11681413. The reversal of 11681405 is 50418611.

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 8048569 + 3632836 = 2837^2 + 1906^2 .

It is not a de Polignac number, because 11681405 - 2²⁰ = 10632829 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 1168136 + ... + 1168145.

It is an arithmetic number, because the mean of its divisors is an integer number (3504423).

Almost surely, 2^11681405 is an apocalyptic number.

It is an amenable number.

11681405 is a deficient number, since it is larger than the sum of its proper divisors (2336287).

11681405 is an equidigital number, since it uses as much as digits as its factorization.

11681405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2336286.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 11681405 is about 3417.8070454606. The cubic root of 11681405 is about 226.8985360360.

The spelling of 11681405 in words is "eleven million, six hundred eighty-one thousand, four hundred five".