11571986 has 16 divisors (see below), whose sum is σ = 18109440. Its totient is φ = 5538960.

The previous prime is 11571983. The next prime is 11572037. The reversal of 11571986 is 68917511.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11571983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6581 + ... + 8151.

It is an arithmetic number, because the mean of its divisors is an integer number (1131840).

Almost surely, 2^11571986 is an apocalyptic number.

11571986 is a deficient number, since it is larger than the sum of its proper divisors (6537454).

11571986 is a wasteful number, since it uses less digits than its factorization.

11571986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1729.

The product of its digits is 15120, while the sum is 38.

The square root of 11571986 is about 3401.7621903949. The cubic root of 11571986 is about 226.1878642593.

The spelling of 11571986 in words is "eleven million, five hundred seventy-one thousand, nine hundred eighty-six".