3973439857 has 4 divisors (see below), whose sum is σ = 3976960420. Its totient is φ = 3969919296.

The previous prime is 3973439837. The next prime is 3973439867. The reversal of 3973439857 is 7589343793.

It is a happy number.

3973439857 is digitally balanced in base 3, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 1886686096 + 2086753761 = 43436^2 + 45681^2 .

It is a cyclic number.

It is not a de Polignac number, because 3973439857 - 2¹⁵ = 3973407089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3973439807) 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, 1758588 + ... + 1760845.

It is an arithmetic number, because the mean of its divisors is an integer number (994240105).

Almost surely, 2^3973439857 is an apocalyptic number.

It is an amenable number.

3973439857 is a deficient number, since it is larger than the sum of its proper divisors (3520563).

3973439857 is a wasteful number, since it uses less digits than its factorization.

3973439857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3520562.

The product of its digits is 17146080, while the sum is 58.

The square root of 3973439857 is about 63035.2271115128. The cubic root of 3973439857 is about 1583.8797800610.

The spelling of 3973439857 in words is "three billion, nine hundred seventy-three million, four hundred thirty-nine thousand, eight hundred fifty-seven".