255640039 has 2 divisors, whose sum is σ = 255640040. Its totient is φ = 255640038.

The previous prime is 255640037. The next prime is 255640069. The reversal of 255640039 is 930046552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 255640039 - 2¹ = 255640037 is a prime.

Together with 255640037, it forms a pair of twin primes.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 255639986 and 255640013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255640037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127820019 + 127820020.

It is an arithmetic number, because the mean of its divisors is an integer number (127820020).

Almost surely, 2^255640039 is an apocalyptic number.

255640039 is a deficient number, since it is larger than the sum of its proper divisors (1).

255640039 is an equidigital number, since it uses as much as digits as its factorization.

255640039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 255640039 is about 15988.7472617463. The cubic root of 255640039 is about 634.6626757376.

The spelling of 255640039 in words is "two hundred fifty-five million, six hundred forty thousand, thirty-nine".