309485 has 16 divisors (see below), whose sum is σ = 430272. Its totient is φ = 211200.

The previous prime is 309481. The next prime is 309493. The reversal of 309485 is 584903.

It is not a de Polignac number, because 309485 - 2² = 309481 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

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 309485.

It is not an unprimeable number, because it can be changed into a prime (309481) 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 15 ways as a sum of consecutive naturals, for example, 770 + ... + 1100.

It is an arithmetic number, because the mean of its divisors is an integer number (26892).

2³⁰⁹⁴⁸⁵ is an apocalyptic number.

It is an amenable number.

309485 is a deficient number, since it is larger than the sum of its proper divisors (120787).

309485 is a wasteful number, since it uses less digits than its factorization.

309485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 309485 is about 556.3137603907. The cubic root of 309485 is about 67.6414955950.

The spelling of 309485 in words is "three hundred nine thousand, four hundred eighty-five".