670409 has 2 divisors, whose sum is σ = 670410. Its totient is φ = 670408.

The previous prime is 670399. The next prime is 670447. The reversal of 670409 is 904076.

670409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 644809 + 25600 = 803^2 + 160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-670409 is a prime.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 670409.

It is not a weakly prime, because it can be changed into another prime (670489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335204 + 335205.

It is an arithmetic number, because the mean of its divisors is an integer number (335205).

2⁶⁷⁰⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

670409 is a deficient number, since it is larger than the sum of its proper divisors (1).

670409 is an equidigital number, since it uses as much as digits as its factorization.

670409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 670409 is about 818.7850755846. The cubic root of 670409 is about 87.5212030249.

The spelling of 670409 in words is "six hundred seventy thousand, four hundred nine".