255840039 has 80 divisors (see below), whose sum is σ = 478927680. Its totient is φ = 132503040.

The previous prime is 255840037. The next prime is 255840047. The reversal of 255840039 is 930048552.

It is not a de Polignac number, because 255840039 - 2¹ = 255840037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 255839985 and 255840012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255840037) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 449347 + ... + 449915.

It is an arithmetic number, because the mean of its divisors is an integer number (5986596).

Almost surely, 2^255840039 is an apocalyptic number.

255840039 is a deficient number, since it is larger than the sum of its proper divisors (223087641).

255840039 is a wasteful number, since it uses less digits than its factorization.

255840039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662 (or 653 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 255840039 is about 15995.0004376368. Note that the first 3 decimals coincide. The cubic root of 255840039 is about 634.8281420552.

The spelling of 255840039 in words is "two hundred fifty-five million, eight hundred forty thousand, thirty-nine".