12801857 has 4 divisors (see below), whose sum is σ = 12880560. Its totient is φ = 12723156.

The previous prime is 12801829. The next prime is 12801863. The reversal of 12801857 is 75810821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75810821 = 3659 ⋅20719.

It is a cyclic number.

It is not a de Polignac number, because 12801857 - 2⁶ = 12801793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12801157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39107 + ... + 39432.

It is an arithmetic number, because the mean of its divisors is an integer number (3220140).

Almost surely, 2^12801857 is an apocalyptic number.

It is an amenable number.

12801857 is a deficient number, since it is larger than the sum of its proper divisors (78703).

12801857 is an equidigital number, since it uses as much as digits as its factorization.

12801857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78702.

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

The square root of 12801857 is about 3577.9682782272. The cubic root of 12801857 is about 233.9327308036.

The spelling of 12801857 in words is "twelve million, eight hundred one thousand, eight hundred fifty-seven".