397907171 has 4 divisors (see below), whose sum is σ = 403846152. Its totient is φ = 391968192.

The previous prime is 397907143. The next prime is 397907201. The reversal of 397907171 is 171709793.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 171709793 = 43 ⋅3993251.

It is a cyclic number.

It is not a de Polignac number, because 397907171 - 2²² = 393712867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397907141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2969390 + ... + 2969523.

It is an arithmetic number, because the mean of its divisors is an integer number (100961538).

Almost surely, 2^397907171 is an apocalyptic number.

397907171 is a deficient number, since it is larger than the sum of its proper divisors (5938981).

397907171 is an equidigital number, since it uses as much as digits as its factorization.

397907171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5938980.

The product of its (nonzero) digits is 83349, while the sum is 44.

The square root of 397907171 is about 19947.6106589235. The cubic root of 397907171 is about 735.5190441132.

The spelling of 397907171 in words is "three hundred ninety-seven million, nine hundred seven thousand, one hundred seventy-one".