1603643 has 6 divisors (see below), whose sum is σ = 1634724. Its totient is φ = 1572924.

The previous prime is 1603631. The next prime is 1603649. The reversal of 1603643 is 3463061.

It is a de Polignac number, because none of the positive numbers 2^k-1603643 is a prime.

It is a d-powerful number, because it can be written as 1 + 6⁴ + 0 + 3⁵ + 6⁵ + 4 + 3¹³ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1603649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11468 + ... + 11606.

It is an arithmetic number, because the mean of its divisors is an integer number (272454).

2^1603643 is an apocalyptic number.

1603643 is a deficient number, since it is larger than the sum of its proper divisors (31081).

1603643 is an frugal number, since it uses more digits than its factorization.

1603643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 1603643 is about 1266.3502675011. The cubic root of 1603643 is about 117.0494105473.

The spelling of 1603643 in words is "one million, six hundred three thousand, six hundred forty-three".