256196986 has 4 divisors (see below), whose sum is σ = 384295482. Its totient is φ = 128098492.

The previous prime is 256196971. The next prime is 256196999. The reversal of 256196986 is 689691652.

256196986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 128936025 + 127260961 = 11355^2 + 11281^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64049245 + ... + 64049248.

Almost surely, 2^256196986 is an apocalyptic number.

256196986 is a deficient number, since it is larger than the sum of its proper divisors (128098496).

256196986 is a wasteful number, since it uses less digits than its factorization.

256196986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128098495.

The product of its digits is 1399680, while the sum is 52.

The square root of 256196986 is about 16006.1546287670. The cubic root of 256196986 is about 635.1232414195.

The spelling of 256196986 in words is "two hundred fifty-six million, one hundred ninety-six thousand, nine hundred eighty-six".