397841 has 4 divisors (see below), whose sum is σ = 418800. Its totient is φ = 376884.

The previous prime is 397829. The next prime is 397849. The reversal of 397841 is 148793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 397841 - 2¹⁸ = 135697 is a prime.

It is a super-2 number, since 2×397841² = 316554922562, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 397798 and 397807.

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, 10451 + ... + 10488.

It is an arithmetic number, because the mean of its divisors is an integer number (104700).

2³⁹⁷⁸⁴¹ is an apocalyptic number.

It is an amenable number.

397841 is a deficient number, since it is larger than the sum of its proper divisors (20959).

397841 is a wasteful number, since it uses less digits than its factorization.

397841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20958.

The product of its digits is 6048, while the sum is 32.

The square root of 397841 is about 630.7463832635. The cubic root of 397841 is about 73.5478270174.

The spelling of 397841 in words is "three hundred ninety-seven thousand, eight hundred forty-one".