209397 has 8 divisors (see below), whose sum is σ = 281344. Its totient is φ = 138528.

The previous prime is 209393. The next prime is 209401. The reversal of 209397 is 793902.

It is an interprime number because it is at equal distance from previous prime (209393) and next prime (209401).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 209397 - 2² = 209393 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 513 + ... + 825.

It is an arithmetic number, because the mean of its divisors is an integer number (35168).

2²⁰⁹³⁹⁷ is an apocalyptic number.

It is an amenable number.

209397 is a deficient number, since it is larger than the sum of its proper divisors (71947).

209397 is a wasteful number, since it uses less digits than its factorization.

209397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539.

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

The square root of 209397 is about 457.5991695797. The cubic root of 209397 is about 59.3822731626.

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

The spelling of 209397 in words is "two hundred nine thousand, three hundred ninety-seven".