12109857 has 8 divisors (see below), whose sum is σ = 16162560. Its totient is φ = 8065200.

The previous prime is 12109847. The next prime is 12109861. The reversal of 12109857 is 75890121.

12109857 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12109857 - 2¹⁶ = 12044321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12109817) 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, 4819 + ... + 6887.

It is an arithmetic number, because the mean of its divisors is an integer number (2020320).

Almost surely, 2^12109857 is an apocalyptic number.

It is an amenable number.

12109857 is a deficient number, since it is larger than the sum of its proper divisors (4052703).

12109857 is a wasteful number, since it uses less digits than its factorization.

12109857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4023.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 12109857 is about 3479.9219818841. The cubic root of 12109857 is about 229.6393655162.

Adding to 12109857 its reverse (75890121), we get a palindrome (87999978).

The spelling of 12109857 in words is "twelve million, one hundred nine thousand, eight hundred fifty-seven".