12778459 has 8 divisors (see below), whose sum is σ = 13072752. Its totient is φ = 12486240.

The previous prime is 12778453. The next prime is 12778471. The reversal of 12778459 is 95487721.

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 12778459 - 2⁵ = 12778427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12778453) 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, 24172 + ... + 24694.

It is an arithmetic number, because the mean of its divisors is an integer number (1634094).

Almost surely, 2^12778459 is an apocalyptic number.

12778459 is a deficient number, since it is larger than the sum of its proper divisors (294293).

12778459 is an equidigital number, since it uses as much as digits as its factorization.

12778459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037.

The product of its digits is 141120, while the sum is 43.

The square root of 12778459 is about 3574.6970501009. The cubic root of 12778459 is about 233.7901239900.

The spelling of 12778459 in words is "twelve million, seven hundred seventy-eight thousand, four hundred fifty-nine".