11820447 has 6 divisors (see below), whose sum is σ = 17073992. Its totient is φ = 7880292.

The previous prime is 11820443. The next prime is 11820463. The reversal of 11820447 is 74402811.

It is not a de Polignac number, because 11820447 - 2² = 11820443 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11820447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11820443) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 656683 + ... + 656700.

Almost surely, 2^11820447 is an apocalyptic number.

11820447 is a deficient number, since it is larger than the sum of its proper divisors (5253545).

11820447 is a wasteful number, since it uses less digits than its factorization.

11820447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313389 (or 1313386 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 11820447 is about 3438.0876952166. The cubic root of 11820447 is about 227.7952339763.

The spelling of 11820447 in words is "eleven million, eight hundred twenty thousand, four hundred forty-seven".