670309 has 4 divisors (see below), whose sum is σ = 686700. Its totient is φ = 653920.

The previous prime is 670303. The next prime is 670321. The reversal of 670309 is 903076.

670309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 65025 + 605284 = 255^2 + 778^2 .

It is a cyclic number.

It is not a de Polignac number, because 670309 - 2¹⁷ = 539237 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670303) 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, 8134 + ... + 8215.

It is an arithmetic number, because the mean of its divisors is an integer number (171675).

2⁶⁷⁰³⁰⁹ is an apocalyptic number.

It is an amenable number.

670309 is a deficient number, since it is larger than the sum of its proper divisors (16391).

670309 is a wasteful number, since it uses less digits than its factorization.

670309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16390.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 670309 is about 818.7240072210. The cubic root of 670309 is about 87.5168511763.

It can be divided in two parts, 670 and 309, that added together give a palindrome (979).

The spelling of 670309 in words is "six hundred seventy thousand, three hundred nine".