397209 has 4 divisors (see below), whose sum is σ = 529616. Its totient is φ = 264804.

The previous prime is 397183. The next prime is 397211. The reversal of 397209 is 902793.

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, and also an emirpimes, since its reverse is a distinct semiprime: 902793 = 3 ⋅300931.

It is not a de Polignac number, because 397209 - 2⁸ = 396953 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397259) 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, 66199 + ... + 66204.

It is an arithmetic number, because the mean of its divisors is an integer number (132404).

2³⁹⁷²⁰⁹ is an apocalyptic number.

It is an amenable number.

397209 is a deficient number, since it is larger than the sum of its proper divisors (132407).

397209 is a wasteful number, since it uses less digits than its factorization.

397209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132406.

The product of its (nonzero) digits is 3402, while the sum is 30.

The square root of 397209 is about 630.2451903823. The cubic root of 397209 is about 73.5088609799.

It can be divided in two parts, 397 and 209, that added together give a palindrome (606).

The spelling of 397209 in words is "three hundred ninety-seven thousand, two hundred nine".