256040009 has 8 divisors (see below), whose sum is σ = 271302048. Its totient is φ = 240800320.

The previous prime is 256040003. The next prime is 256040021. The reversal of 256040009 is 900040652.

256040009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 256040009 - 2²⁰ = 254991433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256040009.

It is not an unprimeable number, because it can be changed into a prime (256040003) 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, 21914 + ... + 31500.

It is an arithmetic number, because the mean of its divisors is an integer number (33912756).

Almost surely, 2^256040009 is an apocalyptic number.

It is an amenable number.

256040009 is a deficient number, since it is larger than the sum of its proper divisors (15262039).

256040009 is a wasteful number, since it uses less digits than its factorization.

256040009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11175.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 256040009 is about 16001.2502324037. The cubic root of 256040009 is about 634.9934973604.

The spelling of 256040009 in words is "two hundred fifty-six million, forty thousand, nine".