309413 has 4 divisors (see below), whose sum is σ = 333228.
Its totient is φ = 285600.
The previous prime is 309403. The next prime is 309433. The reversal of 309413 is 314903.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 134689 + 174724 = 367^2 + 418^2
It is a cyclic number.
It is not a de Polignac number, because 309413 - 28 = 309157 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 (309403) 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, 11888 + ... + 11913.
It is an arithmetic number, because the mean of its divisors is an integer number (83307).
2309413 is an apocalyptic number.
It is an amenable number.
309413 is a deficient number, since it is larger than the sum of its proper divisors (23815).
309413 is a wasteful number, since it uses less digits than its factorization.
309413 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 23814.
The product of its (nonzero) digits is 324, while the sum is 20.
The square root of 309413 is about 556.2490449430.
The cubic root of 309413 is about 67.6362497129.
The spelling of 309413 in words is "three hundred nine thousand, four hundred thirteen".