12877789 has 4 divisors (see below), whose sum is σ = 13635324. Its totient is φ = 12120256.

The previous prime is 12877757. The next prime is 12877807. The reversal of 12877789 is 98777821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5359225 + 7518564 = 2315^2 + 2742^2 .

It is a cyclic number.

It is not a de Polignac number, because 12877789 - 2⁵ = 12877757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12877289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378742 + ... + 378775.

It is an arithmetic number, because the mean of its divisors is an integer number (3408831).

Almost surely, 2^12877789 is an apocalyptic number.

It is an amenable number.

12877789 is a deficient number, since it is larger than the sum of its proper divisors (757535).

12877789 is an equidigital number, since it uses as much as digits as its factorization.

12877789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757534.

The product of its digits is 395136, while the sum is 49.

The square root of 12877789 is about 3588.5636402327. The cubic root of 12877789 is about 234.3943298783.

The spelling of 12877789 in words is "twelve million, eight hundred seventy-seven thousand, seven hundred eighty-nine".