397847 has 4 divisors (see below), whose sum is σ = 401016. Its totient is φ = 394680.

The previous prime is 397829. The next prime is 397849. The reversal of 397847 is 748793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 748793 = 139 ⋅5387.

It is a cyclic number.

It is not a de Polignac number, because 397847 - 2⁸ = 397591 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 397847.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 397847.

It is not an unprimeable number, because it can be changed into a prime (397849) 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, 1388 + ... + 1649.

It is an arithmetic number, because the mean of its divisors is an integer number (100254).

2³⁹⁷⁸⁴⁷ is an apocalyptic number.

397847 is a deficient number, since it is larger than the sum of its proper divisors (3169).

397847 is a wasteful number, since it uses less digits than its factorization.

397847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3168.

The product of its digits is 42336, while the sum is 38.

The square root of 397847 is about 630.7511395154. The cubic root of 397847 is about 73.5481967503.

It can be divided in two parts, 3978 and 47, that multiplied together give a triangular number (186966 = T₆₁₁).

The spelling of 397847 in words is "three hundred ninety-seven thousand, eight hundred forty-seven".