12878705 has 16 divisors (see below), whose sum is σ = 18040320. Its totient is φ = 8642112.

The previous prime is 12878699. The next prime is 12878729. The reversal of 12878705 is 50787821.

It is a cyclic number.

It is not a de Polignac number, because 12878705 - 2¹⁶ = 12813169 is a prime.

It is a super-2 number, since 2×12878705² = 331722084954050, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2270 + ... + 5559.

It is an arithmetic number, because the mean of its divisors is an integer number (1127520).

Almost surely, 2^12878705 is an apocalyptic number.

It is an amenable number.

12878705 is a deficient number, since it is larger than the sum of its proper divisors (5161615).

12878705 is an equidigital number, since it uses as much as digits as its factorization.

12878705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7888.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 12878705 is about 3588.6912656287. The cubic root of 12878705 is about 234.3998872535.

The spelling of 12878705 in words is "twelve million, eight hundred seventy-eight thousand, seven hundred five".