1603399 has 12 divisors (see below), whose sum is σ = 1920016. Its totient is φ = 1311552.

The previous prime is 1603397. The next prime is 1603403. The reversal of 1603399 is 9933061.

It is not a de Polignac number, because 1603399 - 2¹ = 1603397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1603399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1603397) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3487 + ... + 3919.

2^1603399 is an apocalyptic number.

1603399 is a deficient number, since it is larger than the sum of its proper divisors (316617).

1603399 is an equidigital number, since it uses as much as digits as its factorization.

1603399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486 (or 463 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 31.

The square root of 1603399 is about 1266.2539239821. The cubic root of 1603399 is about 117.0434737512.

It can be divided in two parts, 1603 and 399, that added together give a palindrome (2002).

The spelling of 1603399 in words is "one million, six hundred three thousand, three hundred ninety-nine".