11621765 has 4 divisors (see below), whose sum is σ = 13946124. Its totient is φ = 9297408.

The previous prime is 11621723. The next prime is 11621773. The reversal of 11621765 is 56712611.

11621765 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.

It can be written as a sum of positive squares in 2 ways, for example, as 4255969 + 7365796 = 2063^2 + 2714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11621765 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 1162172 + ... + 1162181.

It is an arithmetic number, because the mean of its divisors is an integer number (3486531).

Almost surely, 2^11621765 is an apocalyptic number.

It is an amenable number.

11621765 is a deficient number, since it is larger than the sum of its proper divisors (2324359).

11621765 is an equidigital number, since it uses as much as digits as its factorization.

11621765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2324358.

The product of its digits is 2520, while the sum is 29.

The square root of 11621765 is about 3409.0709878206. The cubic root of 11621765 is about 226.5117297098.

The spelling of 11621765 in words is "eleven million, six hundred twenty-one thousand, seven hundred sixty-five".