670385 has 4 divisors (see below), whose sum is σ = 804468. Its totient is φ = 536304.

The previous prime is 670379. The next prime is 670399. The reversal of 670385 is 583076.

670385 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 519841 + 150544 = 721^2 + 388^2 .

It is a cyclic number.

It is not a de Polignac number, because 670385 - 2⁶ = 670321 is a prime.

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67034 + ... + 67043.

It is an arithmetic number, because the mean of its divisors is an integer number (201117).

2⁶⁷⁰³⁸⁵ is an apocalyptic number.

It is an amenable number.

670385 is a deficient number, since it is larger than the sum of its proper divisors (134083).

670385 is a wasteful number, since it uses less digits than its factorization.

670385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134082.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 670385 is about 818.7704195927. The cubic root of 670385 is about 87.5201586207.

The spelling of 670385 in words is "six hundred seventy thousand, three hundred eighty-five".