254640839 has 2 divisors, whose sum is σ = 254640840. Its totient is φ = 254640838.

The previous prime is 254640833. The next prime is 254640899. The reversal of 254640839 is 938046452.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 254640839 - 2²⁰ = 253592263 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 254640796 and 254640805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (254640833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127320419 + 127320420.

It is an arithmetic number, because the mean of its divisors is an integer number (127320420).

Almost surely, 2^254640839 is an apocalyptic number.

254640839 is a deficient number, since it is larger than the sum of its proper divisors (1).

254640839 is an equidigital number, since it uses as much as digits as its factorization.

254640839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 41.

The square root of 254640839 is about 15957.4696929056. The cubic root of 254640839 is about 633.8347107983.

The spelling of 254640839 in words is "two hundred fifty-four million, six hundred forty thousand, eight hundred thirty-nine".