12778039 has 4 divisors (see below), whose sum is σ = 12968824. Its totient is φ = 12587256.

The previous prime is 12778037. The next prime is 12778063. The reversal of 12778039 is 93087721.

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

It is a cyclic number.

It is not a de Polignac number, because 12778039 - 2¹ = 12778037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12777989 and 12778007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12778037) 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, 95292 + ... + 95425.

It is an arithmetic number, because the mean of its divisors is an integer number (3242206).

Almost surely, 2^12778039 is an apocalyptic number.

12778039 is a deficient number, since it is larger than the sum of its proper divisors (190785).

12778039 is an equidigital number, since it uses as much as digits as its factorization.

12778039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190784.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 12778039 is about 3574.6383033812. The cubic root of 12778039 is about 233.7875625719.

It can be divided in two parts, 1277 and 8039, that added together give a triangular number (9316 = T₁₃₆).

The spelling of 12778039 in words is "twelve million, seven hundred seventy-eight thousand, thirty-nine".