4256839 has 2 divisors, whose sum is σ = 4256840. Its totient is φ = 4256838.

The previous prime is 4256831. The next prime is 4256897. The reversal of 4256839 is 9386524.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4256839 - 2³ = 4256831 is a prime.

It is a d-powerful number, because it can be written as 4¹¹ + 2⁷ + 5⁵ + 6³ + 8 + 3¹⁰ + 9 .

It is a junction number, because it is equal to n+sod(n) for n = 4256798 and 4256807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4256831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2128419 + 2128420.

It is an arithmetic number, because the mean of its divisors is an integer number (2128420).

Almost surely, 2^4256839 is an apocalyptic number.

4256839 is a deficient number, since it is larger than the sum of its proper divisors (1).

4256839 is an equidigital number, since it uses as much as digits as its factorization.

4256839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 37.

The square root of 4256839 is about 2063.2108471991. The cubic root of 4256839 is about 162.0674286191.

The spelling of 4256839 in words is "four million, two hundred fifty-six thousand, eight hundred thirty-nine".