1604021003 has 32 divisors (see below), whose sum is σ = 1851870720. Its totient is φ = 1378529280.

The previous prime is 1604020981. The next prime is 1604021011. The reversal of 1604021003 is 3001204061.

It is a cyclic number.

It is not a de Polignac number, because 1604021003 - 2¹² = 1604016907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1604021603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1445813 + ... + 1446921.

It is an arithmetic number, because the mean of its divisors is an integer number (57870960).

Almost surely, 2^1604021003 is an apocalyptic number.

1604021003 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1604021003 is a deficient number, since it is larger than the sum of its proper divisors (247849717).

1604021003 is a wasteful number, since it uses less digits than its factorization.

1604021003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1604021003 is about 40050.2309980854. The cubic root of 1604021003 is about 1170.5860659915.

Adding to 1604021003 its reverse (3001204061), we get a palindrome (4605225064).

The spelling of 1604021003 in words is "one billion, six hundred four million, twenty-one thousand, three".