2001979856 has 10 divisors (see below), whose sum is σ = 3878836002. Its totient is φ = 1000989920.

The previous prime is 2001979817. The next prime is 2001979871. The reversal of 2001979856 is 6589791002.

It can be written as a sum of positive squares in only one way, i.e., 1298881600 + 703098256 = 36040^2 + 26516^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2001979856.

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, 62561855 + ... + 62561886.

Almost surely, 2^2001979856 is an apocalyptic number.

It is an amenable number.

2001979856 is a deficient number, since it is larger than the sum of its proper divisors (1876856146).

2001979856 is a wasteful number, since it uses less digits than its factorization.

2001979856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125123749 (or 125123743 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 2001979856 is about 44743.4895375852. The cubic root of 2001979856 is about 1260.3366564932.

The spelling of 2001979856 in words is "two billion, one million, nine hundred seventy-nine thousand, eight hundred fifty-six".