256199815 has 8 divisors (see below), whose sum is σ = 310161168. Its totient is φ = 203145600.

The previous prime is 256199753. The next prime is 256199861. The reversal of 256199815 is 518991652.

256199815 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 not a de Polignac number, because 256199815 - 2¹³ = 256191623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226161 + ... + 227290.

It is an arithmetic number, because the mean of its divisors is an integer number (38770146).

Almost surely, 2^256199815 is an apocalyptic number.

256199815 is a deficient number, since it is larger than the sum of its proper divisors (53961353).

256199815 is a wasteful number, since it uses less digits than its factorization.

256199815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453569.

The product of its digits is 194400, while the sum is 46.

The square root of 256199815 is about 16006.2430007794. The cubic root of 256199815 is about 635.1255791481.

The spelling of 256199815 in words is "two hundred fifty-six million, one hundred ninety-nine thousand, eight hundred fifteen".