11971845 has 48 divisors (see below), whose sum is σ = 22239360. Its totient is φ = 5943168.

The previous prime is 11971829. The next prime is 11971853. The reversal of 11971845 is 54817911.

11971845 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11971845 - 2⁴ = 11971829 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44371 + ... + 44639.

It is an arithmetic number, because the mean of its divisors is an integer number (463320).

Almost surely, 2^11971845 is an apocalyptic number.

11971845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11971845 is a deficient number, since it is larger than the sum of its proper divisors (10267515).

11971845 is a wasteful number, since it uses less digits than its factorization.

11971845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346 (or 343 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 11971845 is about 3460.0354044431. The cubic root of 11971845 is about 228.7636559079.

The spelling of 11971845 in words is "eleven million, nine hundred seventy-one thousand, eight hundred forty-five".