397609 has 4 divisors (see below), whose sum is σ = 399616. Its totient is φ = 395604.

The previous prime is 397597. The next prime is 397633. The reversal of 397609 is 906793.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397609 is a prime.

397609 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (398609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 669 + ... + 1114.

It is an arithmetic number, because the mean of its divisors is an integer number (99904).

2³⁹⁷⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

397609 is a deficient number, since it is larger than the sum of its proper divisors (2007).

397609 is a wasteful number, since it uses less digits than its factorization.

397609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2006.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 397609 is about 630.5624473436. The cubic root of 397609 is about 73.5335278261.

The spelling of 397609 in words is "three hundred ninety-seven thousand, six hundred nine".