3977917845 has 32 divisors (see below), whose sum is σ = 6979682304. Its totient is φ = 1918574400.

The previous prime is 3977917813. The next prime is 3977917859. The reversal of 3977917845 is 5487197793.

It is not a de Polignac number, because 3977917845 - 2⁵ = 3977917813 is a prime.

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 in 31 ways as a sum of consecutive naturals, for example, 31597 + ... + 94626.

It is an arithmetic number, because the mean of its divisors is an integer number (218115072).

Almost surely, 2^3977917845 is an apocalyptic number.

It is an amenable number.

3977917845 is a deficient number, since it is larger than the sum of its proper divisors (3001764459).

3977917845 is a wasteful number, since it uses less digits than its factorization.

3977917845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126433.

The product of its digits is 13335840, while the sum is 60.

The square root of 3977917845 is about 63070.7368357149. The cubic root of 3977917845 is about 1584.4745570607.

The spelling of 3977917845 in words is "three billion, nine hundred seventy-seven million, nine hundred seventeen thousand, eight hundred forty-five".