309897 has 12 divisors (see below), whose sum is σ = 511680. Its totient is φ = 177048.

The previous prime is 309877. The next prime is 309899. The reversal of 309897 is 798903.

It is not a de Polignac number, because 309897 - 2⁷ = 309769 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 309897.

It is not an unprimeable number, because it can be changed into a prime (309899) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2397 + ... + 2522.

It is an arithmetic number, because the mean of its divisors is an integer number (42640).

2³⁰⁹⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

309897 is a deficient number, since it is larger than the sum of its proper divisors (201783).

309897 is a wasteful number, since it uses less digits than its factorization.

309897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4932 (or 4929 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 309897 is about 556.6839318680. The cubic root of 309897 is about 67.6714980602.

The spelling of 309897 in words is "three hundred nine thousand, eight hundred ninety-seven".