11605643 has 4 divisors (see below), whose sum is σ = 13263600. Its totient is φ = 9947688.

The previous prime is 11605619. The next prime is 11605651. The reversal of 11605643 is 34650611.

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

It is a cyclic number.

It is not a de Polignac number, because 11605643 - 2⁶ = 11605579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11605343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 828968 + ... + 828981.

It is an arithmetic number, because the mean of its divisors is an integer number (3315900).

Almost surely, 2^11605643 is an apocalyptic number.

11605643 is a deficient number, since it is larger than the sum of its proper divisors (1657957).

11605643 is an equidigital number, since it uses as much as digits as its factorization.

11605643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1657956.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 11605643 is about 3406.7055933849. The cubic root of 11605643 is about 226.4069403471.

The spelling of 11605643 in words is "eleven million, six hundred five thousand, six hundred forty-three".