11986649 has 4 divisors (see below), whose sum is σ = 12691764. Its totient is φ = 11281536.

The previous prime is 11986643. The next prime is 11986661. The reversal of 11986649 is 94668911.

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 3489424 + 8497225 = 1868^2 + 2915^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11986649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11986643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352532 + ... + 352565.

It is an arithmetic number, because the mean of its divisors is an integer number (3172941).

Almost surely, 2^11986649 is an apocalyptic number.

It is an amenable number.

11986649 is a deficient number, since it is larger than the sum of its proper divisors (705115).

11986649 is an equidigital number, since it uses as much as digits as its factorization.

11986649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705114.

The product of its digits is 93312, while the sum is 44.

The square root of 11986649 is about 3462.1740279772. The cubic root of 11986649 is about 228.8579110037.

It can be divided in two parts, 119 and 86649, that added together give a palindrome (86768).

The spelling of 11986649 in words is "eleven million, nine hundred eighty-six thousand, six hundred forty-nine".