11997845 has 8 divisors (see below), whose sum is σ = 14473176. Its totient is φ = 9547776.

The previous prime is 11997841. The next prime is 11997847. The reversal of 11997845 is 54879911.

11997845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 5476 + 11992369 = 74^2 + 3463^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11997845 - 2² = 11997841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11997796 and 11997805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11997841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5252 + ... + 7181.

It is an arithmetic number, because the mean of its divisors is an integer number (1809147).

Almost surely, 2^11997845 is an apocalyptic number.

It is an amenable number.

11997845 is a deficient number, since it is larger than the sum of its proper divisors (2475331).

11997845 is a wasteful number, since it uses less digits than its factorization.

11997845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12631.

The product of its digits is 90720, while the sum is 44.

The square root of 11997845 is about 3463.7905537142. The cubic root of 11997845 is about 228.9291429169.

The spelling of 11997845 in words is "eleven million, nine hundred ninety-seven thousand, eight hundred forty-five".