670447409 has 2 divisors, whose sum is σ = 670447410. Its totient is φ = 670447408.

The previous prime is 670447373. The next prime is 670447423. The reversal of 670447409 is 904744076.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 656794384 + 13653025 = 25628^2 + 3695^2 .

It is a cyclic number.

It is not a de Polignac number, because 670447409 - 2⁸ = 670447153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (670447439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335223704 + 335223705.

It is an arithmetic number, because the mean of its divisors is an integer number (335223705).

Almost surely, 2^670447409 is an apocalyptic number.

It is an amenable number.

670447409 is a deficient number, since it is larger than the sum of its proper divisors (1).

670447409 is an equidigital number, since it uses as much as digits as its factorization.

670447409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 41.

The square root of 670447409 is about 25892.9992275905. Note that the first 3 decimals coincide. The cubic root of 670447409 is about 875.2287441144.

The spelling of 670447409 in words is "six hundred seventy million, four hundred forty-seven thousand, four hundred nine".