3945886191897 has 8 divisors (see below), whose sum is σ = 5665887865344. Its totient is φ = 2428237656528.

The previous prime is 3945886191889. The next prime is 3945886192049. The reversal of 3945886191897 is 7981916885493.

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

It is not a de Polignac number, because 3945886191897 - 2³ = 3945886191889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3945886191887) 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 7 ways as a sum of consecutive naturals, for example, 50588284473 + ... + 50588284550.

It is an arithmetic number, because the mean of its divisors is an integer number (708235983168).

Almost surely, 2^{3945886191897} is an apocalyptic number.

It is an amenable number.

3945886191897 is a deficient number, since it is larger than the sum of its proper divisors (1720001673447).

3945886191897 is a wasteful number, since it uses less digits than its factorization.

3945886191897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101176569039.

The product of its digits is 940584960, while the sum is 78.

The spelling of 3945886191897 in words is "three trillion, nine hundred forty-five billion, eight hundred eighty-six million, one hundred ninety-one thousand, eight hundred ninety-seven".