670909 has 4 divisors (see below), whose sum is σ = 706240. Its totient is φ = 635580.

The previous prime is 670903. The next prime is 670919. The reversal of 670909 is 909076.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 670909 - 2⁵ = 670877 is a prime.

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

It is a Duffinian number.

670909 is a modest number, since divided by 909 gives 67 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670903) 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, 17637 + ... + 17674.

It is an arithmetic number, because the mean of its divisors is an integer number (176560).

2⁶⁷⁰⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

670909 is a deficient number, since it is larger than the sum of its proper divisors (35331).

670909 is a wasteful number, since it uses less digits than its factorization.

670909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35330.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 670909 is about 819.0903491069. The cubic root of 670909 is about 87.5429557793.

The spelling of 670909 in words is "six hundred seventy thousand, nine hundred nine".