256173982 has 4 divisors (see below), whose sum is σ = 384260976. Its totient is φ = 128086990.

The previous prime is 256173961. The next prime is 256173991. The reversal of 256173982 is 289371652.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64043494 + ... + 64043497.

It is an arithmetic number, because the mean of its divisors is an integer number (96065244).

Almost surely, 2^256173982 is an apocalyptic number.

256173982 is a deficient number, since it is larger than the sum of its proper divisors (128086994).

256173982 is a wasteful number, since it uses less digits than its factorization.

256173982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128086993.

The product of its digits is 181440, while the sum is 43.

The square root of 256173982 is about 16005.4360140547. The cubic root of 256173982 is about 635.1042315519.

The spelling of 256173982 in words is "two hundred fifty-six million, one hundred seventy-three thousand, nine hundred eighty-two".