402003 has 20 divisors (see below), whose sum is σ = 687280. Its totient is φ = 229392.

The previous prime is 401993. The next prime is 402023. The reversal of 402003 is 300204.

It is not a de Polignac number, because 402003 - 2⁴ = 401987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402023) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 213 + ... + 921.

It is an arithmetic number, because the mean of its divisors is an integer number (34364).

2⁴⁰²⁰⁰³ is an apocalyptic number.

402003 is a deficient number, since it is larger than the sum of its proper divisors (285277).

402003 is an equidigital number, since it uses as much as digits as its factorization.

402003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728 (or 719 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 9.

The square root of 402003 is about 634.0370651626. The cubic root of 402003 is about 73.8034105106.

Adding to 402003 its reverse (300204), we get a palindrome (702207).

The spelling of 402003 in words is "four hundred two thousand, three", and thus it is an iban number.