401003 has 4 divisors (see below), whose sum is σ = 402480. Its totient is φ = 399528.

The previous prime is 400997. The next prime is 401017. The reversal of 401003 is 300104.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 401003 - 2¹⁰ = 399979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401053) 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 3 ways as a sum of consecutive naturals, for example, 200 + ... + 917.

It is an arithmetic number, because the mean of its divisors is an integer number (100620).

2⁴⁰¹⁰⁰³ is an apocalyptic number.

401003 is a deficient number, since it is larger than the sum of its proper divisors (1477).

401003 is a wasteful number, since it uses less digits than its factorization.

401003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1476.

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 401003 is about 633.2479767042. The cubic root of 401003 is about 73.7421632964.

Adding to 401003 its reverse (300104), we get a palindrome (701107).

The spelling of 401003 in words is "four hundred one thousand, three", and thus it is an iban number.