3947873957 has 4 divisors (see below), whose sum is σ = 3948081996. Its totient is φ = 3947665920.

The previous prime is 3947873879. The next prime is 3947873959. The reversal of 3947873957 is 7593787493.

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 3482652196 + 465221761 = 59014^2 + 21569^2 .

It is a cyclic number.

It is not a de Polignac number, because 3947873957 - 2¹⁰ = 3947872933 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3947873957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3947873959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72338 + ... + 114579.

It is an arithmetic number, because the mean of its divisors is an integer number (987020499).

Almost surely, 2^3947873957 is an apocalyptic number.

It is an amenable number.

3947873957 is a deficient number, since it is larger than the sum of its proper divisors (208039).

3947873957 is a wasteful number, since it uses less digits than its factorization.

3947873957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208038.

The product of its digits is 40007520, while the sum is 62.

The square root of 3947873957 is about 62832.1092833911. The cubic root of 3947873957 is about 1580.4754693846.

The spelling of 3947873957 in words is "three billion, nine hundred forty-seven million, eight hundred seventy-three thousand, nine hundred fifty-seven".