1670657 has 2 divisors, whose sum is σ = 1670658.
Its totient is φ = 1670656.
The previous prime is 1670653. The next prime is 1670659. The reversal of 1670657 is 7560761.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 1032256 + 638401 = 1016^2 + 799^2
It is a cyclic number.
It is not a de Polignac number, because 1670657 - 22 = 1670653 is a prime.
Together with 1670659, 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 (1670653) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835328 + 835329.
It is an arithmetic number, because the mean of its divisors is an integer number (835329).
21670657 is an apocalyptic number.
It is an amenable number.
1670657 is a deficient number, since it is larger than the sum of its proper divisors (1).
1670657 is an equidigital number, since it uses as much as digits as its factorization.
1670657 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 8820, while the sum is 32.
The square root of 1670657 is about 1292.5389742673.
The cubic root of 1670657 is about 118.6576560020.
The spelling of 1670657 in words is "one million, six hundred seventy thousand, six hundred fifty-seven".