3957681905 has 8 divisors (see below), whose sum is σ = 4779469032. Its totient is φ = 3145978368.

The previous prime is 3957681901. The next prime is 3957681911. The reversal of 3957681905 is 5091867593.

3957681905 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 447237904 + 3510444001 = 21148^2 + 59249^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3957681905 - 2² = 3957681901 is a prime.

It is a super-2 number, since 2×3957681905² = 31326492122328858050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3957681901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2520032 + ... + 2521601.

It is an arithmetic number, because the mean of its divisors is an integer number (597433629).

Almost surely, 2^3957681905 is an apocalyptic number.

It is an amenable number.

3957681905 is a deficient number, since it is larger than the sum of its proper divisors (821787127).

3957681905 is a wasteful number, since it uses less digits than its factorization.

3957681905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5041795.

The product of its (nonzero) digits is 2041200, while the sum is 53.

The square root of 3957681905 is about 62910.1097201396. The cubic root of 3957681905 is about 1581.7832114077.

The spelling of 3957681905 in words is "three billion, nine hundred fifty-seven million, six hundred eighty-one thousand, nine hundred five".