400403 has 4 divisors (see below), whose sum is σ = 414240. Its totient is φ = 386568.

The previous prime is 400391. The next prime is 400409. The reversal of 400403 is 304004.

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 400403 - 2⁶ = 400339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6875 + ... + 6932.

It is an arithmetic number, because the mean of its divisors is an integer number (103560).

2⁴⁰⁰⁴⁰³ is an apocalyptic number.

400403 is a deficient number, since it is larger than the sum of its proper divisors (13837).

400403 is a wasteful number, since it uses less digits than its factorization.

400403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13836.

The product of its (nonzero) digits is 48, while the sum is 11.

The square root of 400403 is about 632.7740513011. The cubic root of 400403 is about 73.7053660790.

Adding to 400403 its reverse (304004), we get a palindrome (704407).

The spelling of 400403 in words is "four hundred thousand, four hundred three", and thus it is an iban number.