12180857 has 8 divisors (see below), whose sum is σ = 13889736. Its totient is φ = 10582272.

The previous prime is 12180851. The next prime is 12180871. The reversal of 12180857 is 75808121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4541161 + 7639696 = 2131^2 + 2764^2 .

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 12180857 - 2¹⁴ = 12164473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12180851) 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, 27338 + ... + 27779.

It is an arithmetic number, because the mean of its divisors is an integer number (1736217).

Almost surely, 2^12180857 is an apocalyptic number.

12180857 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

12180857 is a deficient number, since it is larger than the sum of its proper divisors (1708879).

12180857 is a wasteful number, since it uses less digits than its factorization.

12180857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55147.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 12180857 is about 3490.1084510370. The cubic root of 12180857 is about 230.0872825630.

Adding to 12180857 its reverse (75808121), we get a palindrome (87988978).

The spelling of 12180857 in words is "twelve million, one hundred eighty thousand, eight hundred fifty-seven".