11997785 has 16 divisors (see below), whose sum is σ = 14790720. Its totient is φ = 9339840.

The previous prime is 11997751. The next prime is 11997787. The reversal of 11997785 is 58779911.

11997785 = 48² + 49² + ... + 330².

11997785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11997785 - 2¹⁸ = 11735641 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11997787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42254 + ... + 42536.

It is an arithmetic number, because the mean of its divisors is an integer number (924420).

Almost surely, 2^11997785 is an apocalyptic number.

It is an amenable number.

11997785 is a deficient number, since it is larger than the sum of its proper divisors (2792935).

11997785 is a wasteful number, since it uses less digits than its factorization.

11997785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488.

The product of its digits is 158760, while the sum is 47.

The square root of 11997785 is about 3463.7818926717. The cubic root of 11997785 is about 228.9287612992.

The spelling of 11997785 in words is "eleven million, nine hundred ninety-seven thousand, seven hundred eighty-five".