670389 has 4 divisors (see below), whose sum is σ = 893856. Its totient is φ = 446924.

The previous prime is 670379. The next prime is 670399. The reversal of 670389 is 983076.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (670379) and next prime (670399).

It is a cyclic number.

It is not a de Polignac number, because 670389 - 2⁷ = 670261 is a prime.

It is a super-2 number, since 2×670389² = 898842822642, which contains 22 as substring.

It is a D-number.

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 (670349) 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 3 ways as a sum of consecutive naturals, for example, 111729 + ... + 111734.

It is an arithmetic number, because the mean of its divisors is an integer number (223464).

2⁶⁷⁰³⁸⁹ is an apocalyptic number.

It is an amenable number.

670389 is a deficient number, since it is larger than the sum of its proper divisors (223467).

670389 is a wasteful number, since it uses less digits than its factorization.

670389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223466.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 670389 is about 818.7728622762. The cubic root of 670389 is about 87.5203326898.

The spelling of 670389 in words is "six hundred seventy thousand, three hundred eighty-nine".