11981596 has 24 divisors (see below), whose sum is σ = 22974336. Its totient is φ = 5422320.

The previous prime is 11981587. The next prime is 11981603. The reversal of 11981596 is 69518911.

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 7 ways as a sum of consecutive naturals, for example, 13065 + ... + 13951.

It is an arithmetic number, because the mean of its divisors is an integer number (957264).

Almost surely, 2^11981596 is an apocalyptic number.

It is an amenable number.

11981596 is a deficient number, since it is larger than the sum of its proper divisors (10992740).

11981596 is a wasteful number, since it uses less digits than its factorization.

11981596 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209 (or 1207 counting only the distinct ones).

The product of its digits is 19440, while the sum is 40.

The square root of 11981596 is about 3461.4442072638. Note that the first 3 decimals coincide. The cubic root of 11981596 is about 228.8257479541.

It can be divided in two parts, 119815 and 96, that added together give a palindrome (119911).

The spelling of 11981596 in words is "eleven million, nine hundred eighty-one thousand, five hundred ninety-six".