256805039 has 8 divisors (see below), whose sum is σ = 263651328. Its totient is φ = 250016440.

The previous prime is 256804997. The next prime is 256805047. The reversal of 256805039 is 930508652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256805039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256804993 and 256805011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256805069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5327 + ... + 23280.

It is an arithmetic number, because the mean of its divisors is an integer number (32956416).

Almost surely, 2^256805039 is an apocalyptic number.

256805039 is a deficient number, since it is larger than the sum of its proper divisors (6846289).

256805039 is a wasteful number, since it uses less digits than its factorization.

256805039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28845.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 256805039 is about 16025.1377217171. The cubic root of 256805039 is about 635.6253075267.

The spelling of 256805039 in words is "two hundred fifty-six million, eight hundred five thousand, thirty-nine".