7978039 has 4 divisors (see below), whose sum is σ = 8113320. Its totient is φ = 7842760.

The previous prime is 7978021. The next prime is 7978063. The reversal of 7978039 is 9308797.

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 7978039 - 2²¹ = 5880887 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7977986 and 7978004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7978099) 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, 67552 + ... + 67669.

It is an arithmetic number, because the mean of its divisors is an integer number (2028330).

Almost surely, 2^7978039 is an apocalyptic number.

7978039 is a deficient number, since it is larger than the sum of its proper divisors (135281).

7978039 is a wasteful number, since it uses less digits than its factorization.

7978039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135280.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 7978039 is about 2824.5422638013. The cubic root of 7978039 is about 199.8168239506.

It can be divided in two parts, 797 and 8039, that added together give a square (8836 = 94²).

The spelling of 7978039 in words is "seven million, nine hundred seventy-eight thousand, thirty-nine".