2006403 has 12 divisors (see below), whose sum is σ = 3112200. Its totient is φ = 1146432.

The previous prime is 2006393. The next prime is 2006429. The reversal of 2006403 is 3046002.

It is not a de Polignac number, because 2006403 - 2⁴ = 2006387 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2006443) 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, 6678 + ... + 6971.

It is an arithmetic number, because the mean of its divisors is an integer number (259350).

2^2006403 is an apocalyptic number.

2006403 is a deficient number, since it is larger than the sum of its proper divisors (1105797).

2006403 is a wasteful number, since it uses less digits than its factorization.

2006403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13666 (or 13659 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 2006403 is about 1416.4755557368. The cubic root of 2006403 is about 126.1264163334.

The spelling of 2006403 in words is "two million, six thousand, four hundred three".