11557985 has 16 divisors (see below), whose sum is σ = 14774400. Its totient is φ = 8654976.

The previous prime is 11557981. The next prime is 11557991. The reversal of 11557985 is 58975511.

It is a cyclic number.

It is not a de Polignac number, because 11557985 - 2² = 11557981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11557981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7772 + ... + 9138.

It is an arithmetic number, because the mean of its divisors is an integer number (923400).

Almost surely, 2^11557985 is an apocalyptic number.

It is an amenable number.

11557985 is a deficient number, since it is larger than the sum of its proper divisors (3216415).

11557985 is a wasteful number, since it uses less digits than its factorization.

11557985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480.

The product of its digits is 63000, while the sum is 41.

The square root of 11557985 is about 3399.7036635566. The cubic root of 11557985 is about 226.0966055263.

The spelling of 11557985 in words is "eleven million, five hundred fifty-seven thousand, nine hundred eighty-five".