1606399 has 2 divisors, whose sum is σ = 1606400. Its totient is φ = 1606398.

The previous prime is 1606387. The next prime is 1606403. The reversal of 1606399 is 9936061.

It is a strong prime.

It is an emirp because it is prime and its reverse (9936061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1606399 - 2⁹ = 1605887 is a prime.

1606399 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1606309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 803199 + 803200.

It is an arithmetic number, because the mean of its divisors is an integer number (803200).

2^1606399 is an apocalyptic number.

1606399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1606399 is an equidigital number, since it uses as much as digits as its factorization.

1606399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 1606399 is about 1267.4379669238. The cubic root of 1606399 is about 117.1164253699.

The spelling of 1606399 in words is "one million, six hundred six thousand, three hundred ninety-nine".