1604399 has 2 divisors, whose sum is σ = 1604400. Its totient is φ = 1604398.

The previous prime is 1604381. The next prime is 1604413. The reversal of 1604399 is 9934061.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1604399 - 2⁸ = 1604143 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 (1604329) 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, 802199 + 802200.

It is an arithmetic number, because the mean of its divisors is an integer number (802200).

2^1604399 is an apocalyptic number.

1604399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604399 is an equidigital number, since it uses as much as digits as its factorization.

1604399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 1604399 is about 1266.6487279431. The cubic root of 1604399 is about 117.0678010604.

The spelling of 1604399 in words is "one million, six hundred four thousand, three hundred ninety-nine".