397878946171 has 16 divisors (see below), whose sum is σ = 464420376576. Its totient is φ = 333763746336.

The previous prime is 397878946151. The next prime is 397878946187. The reversal of 397878946171 is 171649878793.

It is a cyclic number.

It is not a de Polignac number, because 397878946171 - 2¹¹ = 397878944123 is a prime.

It is a super-2 number, since 2×397878946171² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 397878946171.

It is not an unprimeable number, because it can be changed into a prime (397878946151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11210065 + ... + 11245501.

It is an arithmetic number, because the mean of its divisors is an integer number (29026273536).

Almost surely, 2^397878946171 is an apocalyptic number.

397878946171 is a deficient number, since it is larger than the sum of its proper divisors (66541430405).

397878946171 is a wasteful number, since it uses less digits than its factorization.

397878946171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69618.

The product of its digits is 128024064, while the sum is 70.

The spelling of 397878946171 in words is "three hundred ninety-seven billion, eight hundred seventy-eight million, nine hundred forty-six thousand, one hundred seventy-one".