1670399 has 2 divisors, whose sum is σ = 1670400.
Its totient is φ = 1670398.
The previous prime is 1670359. The next prime is 1670407. The reversal of 1670399 is 9930761.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 1670399 - 212 = 1666303 is a prime.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1670359) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835199 + 835200.
It is an arithmetic number, because the mean of its divisors is an integer number (835200).
21670399 is an apocalyptic number.
1670399 is a deficient number, since it is larger than the sum of its proper divisors (1).
1670399 is an equidigital number, since it uses as much as digits as its factorization.
1670399 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 10206, while the sum is 35.
The square root of 1670399 is about 1292.4391668469.
The cubic root of 1670399 is about 118.6515475765.
The spelling of 1670399 in words is "one million, six hundred seventy thousand, three hundred ninety-nine".