12191636 has 6 divisors (see below), whose sum is σ = 21335370. Its totient is φ = 6095816.

The previous prime is 12191593. The next prime is 12191651. The reversal of 12191636 is 63619121.

It can be written as a sum of positive squares in only one way, i.e., 11519236 + 672400 = 3394^2 + 820^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12191599 and 12191608.

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 as a sum of consecutive naturals, namely, 1523951 + ... + 1523958.

It is an arithmetic number, because the mean of its divisors is an integer number (3555895).

Almost surely, 2^12191636 is an apocalyptic number.

It is an amenable number.

12191636 is a deficient number, since it is larger than the sum of its proper divisors (9143734).

12191636 is a wasteful number, since it uses less digits than its factorization.

12191636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3047913 (or 3047911 counting only the distinct ones).

The product of its digits is 1944, while the sum is 29.

The square root of 12191636 is about 3491.6523309173. The cubic root of 12191636 is about 230.1551316373.

The spelling of 12191636 in words is "twelve million, one hundred ninety-one thousand, six hundred thirty-six".