309245 has 8 divisors (see below), whose sum is σ = 374784. Its totient is φ = 244944.

The previous prime is 309241. The next prime is 309251. The reversal of 309245 is 542903.

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

It is a cyclic number.

It is not a de Polignac number, because 309245 - 2² = 309241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 309245.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 309245.

It is not an unprimeable number, because it can be changed into a prime (309241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392 + ... + 878.

It is an arithmetic number, because the mean of its divisors is an integer number (46848).

2³⁰⁹²⁴⁵ is an apocalyptic number.

It is an amenable number.

309245 is a deficient number, since it is larger than the sum of its proper divisors (65539).

309245 is a wasteful number, since it uses less digits than its factorization.

309245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 309245 is about 556.0980129438. The cubic root of 309245 is about 67.6240061559.

The spelling of 309245 in words is "three hundred nine thousand, two hundred forty-five".