3977433865 has 4 divisors (see below), whose sum is σ = 4772920644. Its totient is φ = 3181947088.

The previous prime is 3977433829. The next prime is 3977433893. The reversal of 3977433865 is 5683347793.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 890186896 + 3087246969 = 29836^2 + 55563^2 .

It is a cyclic number.

It is not a de Polignac number, because 3977433865 - 2⁹ = 3977433353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397743382 + ... + 397743391.

It is an arithmetic number, because the mean of its divisors is an integer number (1193230161).

Almost surely, 2^3977433865 is an apocalyptic number.

It is an amenable number.

3977433865 is a deficient number, since it is larger than the sum of its proper divisors (795486779).

3977433865 is an equidigital number, since it uses as much as digits as its factorization.

3977433865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795486778.

The product of its digits is 11430720, while the sum is 55.

The square root of 3977433865 is about 63066.8999158830. The cubic root of 3977433865 is about 1584.4102952092.

The spelling of 3977433865 in words is "three billion, nine hundred seventy-seven million, four hundred thirty-three thousand, eight hundred sixty-five".