1670489 has 2 divisors, whose sum is σ = 1670490. Its totient is φ = 1670488.

The previous prime is 1670477. The next prime is 1670491. The reversal of 1670489 is 9840761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1669264 + 1225 = 1292^2 + 35^2 .

It is a cyclic number.

It is not a de Polignac number, because 1670489 - 2¹² = 1666393 is a prime.

Together with 1670491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1670419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835244 + 835245.

It is an arithmetic number, because the mean of its divisors is an integer number (835245).

2^1670489 is an apocalyptic number.

It is an amenable number.

1670489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1670489 is an equidigital number, since it uses as much as digits as its factorization.

1670489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1670489 is about 1292.4739842643. The cubic root of 1670489 is about 118.6536784940.

The spelling of 1670489 in words is "one million, six hundred seventy thousand, four hundred eighty-nine".