670989 has 8 divisors (see below), whose sum is σ = 976032. Its totient is φ = 406640.

The previous prime is 670987. The next prime is 670991. The reversal of 670989 is 989076.

670989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (670987) and next prime (670991).

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 670989 - 2¹ = 670987 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670987) 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, 10134 + ... + 10199.

It is an arithmetic number, because the mean of its divisors is an integer number (122004).

2⁶⁷⁰⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

670989 is a deficient number, since it is larger than the sum of its proper divisors (305043).

670989 is a wasteful number, since it uses less digits than its factorization.

670989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20347.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 670989 is about 819.1391823127. The cubic root of 670989 is about 87.5464352170.

The spelling of 670989 in words is "six hundred seventy thousand, nine hundred eighty-nine".