256940039 has 2 divisors, whose sum is σ = 256940040. Its totient is φ = 256940038.

The previous prime is 256940027. The next prime is 256940053. The reversal of 256940039 is 930049652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256940039 - 2¹⁶ = 256874503 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 256939984 and 256940011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256940009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128470019 + 128470020.

It is an arithmetic number, because the mean of its divisors is an integer number (128470020).

Almost surely, 2^256940039 is an apocalyptic number.

256940039 is a deficient number, since it is larger than the sum of its proper divisors (1).

256940039 is an equidigital number, since it uses as much as digits as its factorization.

256940039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 256940039 is about 16029.3493005799. The cubic root of 256940039 is about 635.7366687690.

The spelling of 256940039 in words is "two hundred fifty-six million, nine hundred forty thousand, thirty-nine".