2478839 has 4 divisors (see below), whose sum is σ = 2704200. Its totient is φ = 2253480.

The previous prime is 2478809. The next prime is 2478877. The reversal of 2478839 is 9388742.

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 2478839 - 2¹² = 2474743 is a prime.

It is a super-2 number, since 2×2478839² = 12289285575842, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2478796 and 2478805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2478809) 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, 112664 + ... + 112685.

It is an arithmetic number, because the mean of its divisors is an integer number (676050).

2^2478839 is an apocalyptic number.

2478839 is a deficient number, since it is larger than the sum of its proper divisors (225361).

2478839 is a wasteful number, since it uses less digits than its factorization.

2478839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225360.

The product of its digits is 96768, while the sum is 41.

The square root of 2478839 is about 1574.4329137820. The cubic root of 2478839 is about 135.3368633493.

Subtracting 2478839 from its reverse (9388742), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 2478839 in words is "two million, four hundred seventy-eight thousand, eight hundred thirty-nine".