11657885 has 4 divisors (see below), whose sum is σ = 13989468. Its totient is φ = 9326304.

The previous prime is 11657879. The next prime is 11657897. The reversal of 11657885 is 58875611.

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 2735716 + 8922169 = 1654^2 + 2987^2 .

It is a cyclic number.

It is not a de Polignac number, because 11657885 - 2⁸ = 11657629 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1165784 + ... + 1165793.

It is an arithmetic number, because the mean of its divisors is an integer number (3497367).

Almost surely, 2^11657885 is an apocalyptic number.

It is an amenable number.

11657885 is a deficient number, since it is larger than the sum of its proper divisors (2331583).

11657885 is an equidigital number, since it uses as much as digits as its factorization.

11657885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2331582.

The product of its digits is 67200, while the sum is 41.

The square root of 11657885 is about 3414.3645089533. The cubic root of 11657885 is about 226.7461502774.

The spelling of 11657885 in words is "eleven million, six hundred fifty-seven thousand, eight hundred eighty-five".