3856947977 has 4 divisors (see below), whose sum is σ = 3857098500. Its totient is φ = 3856797456.

The previous prime is 3856947973. The next prime is 3856948019. The reversal of 3856947977 is 7797496583.

3856947977 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, and also an emirpimes, since its reverse is a distinct semiprime: 7797496583 = 19 ⋅410394557.

It can be written as a sum of positive squares in 2 ways, for example, as 1072169536 + 2784778441 = 32744^2 + 52771^2 .

It is a cyclic number.

It is not a de Polignac number, because 3856947977 - 2² = 3856947973 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3856947973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26138 + ... + 91635.

It is an arithmetic number, because the mean of its divisors is an integer number (964274625).

Almost surely, 2^3856947977 is an apocalyptic number.

It is an amenable number.

3856947977 is a deficient number, since it is larger than the sum of its proper divisors (150523).

3856947977 is a wasteful number, since it uses less digits than its factorization.

3856947977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150522.

The product of its digits is 80015040, while the sum is 65.

The square root of 3856947977 is about 62104.3313867882. The cubic root of 3856947977 is about 1568.2474632045.

The spelling of 3856947977 in words is "three billion, eight hundred fifty-six million, nine hundred forty-seven thousand, nine hundred seventy-seven".