3976265781 has 20 divisors (see below), whose sum is σ = 5942884992. Its totient is φ = 2649491208.

The previous prime is 3976265773. The next prime is 3976265801. The reversal of 3976265781 is 1875626793.

3976265781 is a `hidden beast` number, since 3 + 9 + 7 + 62 + 6 + 578 + 1 = 666.

It is not a de Polignac number, because 3976265781 - 2³ = 3976265773 is a prime.

It is a super-2 number, since 2×3976265781² = 31621379122303079922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3976265581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 162130 + ... + 185036.

Almost surely, 2^3976265781 is an apocalyptic number.

It is an amenable number.

3976265781 is a deficient number, since it is larger than the sum of its proper divisors (1966619211).

3976265781 is a wasteful number, since it uses less digits than its factorization.

3976265781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25062 (or 25053 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 54.

The square root of 3976265781 is about 63057.6385618745. The cubic root of 3976265781 is about 1584.2551779837.

The spelling of 3976265781 in words is "three billion, nine hundred seventy-six million, two hundred sixty-five thousand, seven hundred eighty-one".