2578939 has 8 divisors (see below), whose sum is σ = 2843568. Its totient is φ = 2319360.

The previous prime is 2578931. The next prime is 2578943. The reversal of 2578939 is 9398752.

It is a happy number.

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 2578939 - 2³ = 2578931 is a prime.

It is a d-powerful number, because it can be written as 2⁷ + 5⁹ + 7⁴ + 8⁵ + 9⁵ + 3³ + 9⁶ .

It is a Duffinian number.

2578939 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2578895 and 2578904.

It is not an unprimeable number, because it can be changed into a prime (2578931) 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, 142 + ... + 2275.

It is an arithmetic number, because the mean of its divisors is an integer number (355446).

2^2578939 is an apocalyptic number.

2578939 is a deficient number, since it is larger than the sum of its proper divisors (264629).

2578939 is a wasteful number, since it uses less digits than its factorization.

2578939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2525.

The product of its digits is 136080, while the sum is 43.

The square root of 2578939 is about 1605.9075315846. The cubic root of 2578939 is about 137.1345934277.

The spelling of 2578939 in words is "two million, five hundred seventy-eight thousand, nine hundred thirty-nine".