397863191 has 8 divisors (see below), whose sum is σ = 435569664. Its totient is φ = 360412920.

The previous prime is 397863163. The next prime is 397863199. The reversal of 397863191 is 191368793.

It is a happy number.

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 397863191 - 2¹⁰ = 397862167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397863199) 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, 60791 + ... + 67016.

It is an arithmetic number, because the mean of its divisors is an integer number (54446208).

Almost surely, 2^397863191 is an apocalyptic number.

397863191 is a deficient number, since it is larger than the sum of its proper divisors (37706473).

397863191 is a wasteful number, since it uses less digits than its factorization.

397863191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128101.

The product of its digits is 244944, while the sum is 47.

The square root of 397863191 is about 19946.5082407924. The cubic root of 397863191 is about 735.4919445602.

The spelling of 397863191 in words is "three hundred ninety-seven million, eight hundred sixty-three thousand, one hundred ninety-one".