12031857 has 6 divisors (see below), whose sum is σ = 17379362. Its totient is φ = 8021232.

The previous prime is 12031847. The next prime is 12031867. The reversal of 12031857 is 75813021.

It is an interprime number because it is at equal distance from previous prime (12031847) and next prime (12031867).

It can be written as a sum of positive squares in only one way, i.e., 10265616 + 1766241 = 3204^2 + 1329^2 .

It is not a de Polignac number, because 12031857 - 2⁷ = 12031729 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 12031857.

It is not an unprimeable number, because it can be changed into a prime (12031837) 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, 668428 + ... + 668445.

Almost surely, 2^12031857 is an apocalyptic number.

It is an amenable number.

12031857 is a deficient number, since it is larger than the sum of its proper divisors (5347505).

12031857 is a wasteful number, since it uses less digits than its factorization.

12031857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336879 (or 1336876 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 12031857 is about 3468.6967293207. The cubic root of 12031857 is about 229.1452648370.

Adding to 12031857 its reverse (75813021), we get a palindrome (87844878).

The spelling of 12031857 in words is "twelve million, thirty-one thousand, eight hundred fifty-seven".