2778039 has 18 divisors (see below), whose sum is σ = 4412408. Its totient is φ = 1683000.

The previous prime is 2778023. The next prime is 2778049. The reversal of 2778039 is 9308772.

It is not a de Polignac number, because 2778039 - 2⁴ = 2778023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2777994 and 2778012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 187 + ... + 2364.

2^2778039 is an apocalyptic number.

2778039 is a deficient number, since it is larger than the sum of its proper divisors (1634369).

2778039 is a wasteful number, since it uses less digits than its factorization.

2778039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2579 (or 2565 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 2778039 is about 1666.7450314910. The cubic root of 2778039 is about 140.5765172126.

The spelling of 2778039 in words is "two million, seven hundred seventy-eight thousand, thirty-nine".