256976949 has 16 divisors (see below), whose sum is σ = 355303424. Its totient is φ = 165034800.

The previous prime is 256976933. The next prime is 256976989. The reversal of 256976949 is 949679652.

It is a happy number.

It is not a de Polignac number, because 256976949 - 2⁴ = 256976933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256976989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14544 + ... + 26934.

It is an arithmetic number, because the mean of its divisors is an integer number (22206464).

Almost surely, 2^256976949 is an apocalyptic number.

It is an amenable number.

256976949 is a deficient number, since it is larger than the sum of its proper divisors (98326475).

256976949 is a wasteful number, since it uses less digits than its factorization.

256976949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12648.

The product of its digits is 7348320, while the sum is 57.

The square root of 256976949 is about 16030.5005848227. The cubic root of 256976949 is about 635.7671089669.

The spelling of 256976949 in words is "two hundred fifty-six million, nine hundred seventy-six thousand, nine hundred forty-nine".