40403 has 4 divisors (see below), whose sum is σ = 44088. Its totient is φ = 36720.

The previous prime is 40387. The next prime is 40423. The reversal of 40403 is 30404.

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 40403 - 2⁴ = 40387 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (11), and also a Moran number because the ratio is a prime number: 3673 = 40403 / (4 + 0 + 4 + 0 + 3).

It is not an unprimeable number, because it can be changed into a prime (40423) 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, 1826 + ... + 1847.

It is an arithmetic number, because the mean of its divisors is an integer number (11022).

2⁴⁰⁴⁰³ is an apocalyptic number.

40403 is a deficient number, since it is larger than the sum of its proper divisors (3685).

40403 is a wasteful number, since it uses less digits than its factorization.

40403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3684.

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

The square root of 40403 is about 201.0049750628. The cubic root of 40403 is about 34.3139887465.

Adding to 40403 its reverse (30404), we get a palindrome (70807).

Subtracting from 40403 its reverse (30404), we obtain a palindrome (9999).

The spelling of 40403 in words is "forty thousand, four hundred three", and thus it is an iban number.