256040894 has 4 divisors (see below), whose sum is σ = 384061344. Its totient is φ = 128020446.

The previous prime is 256040887. The next prime is 256040921. The reversal of 256040894 is 498040652.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64010222 + ... + 64010225.

It is an arithmetic number, because the mean of its divisors is an integer number (96015336).

Almost surely, 2^256040894 is an apocalyptic number.

256040894 is a deficient number, since it is larger than the sum of its proper divisors (128020450).

256040894 is a wasteful number, since it uses less digits than its factorization.

256040894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128020449.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 256040894 is about 16001.2778864689. The cubic root of 256040894 is about 634.9942289760.

The spelling of 256040894 in words is "two hundred fifty-six million, forty thousand, eight hundred ninety-four".