403643 has 4 divisors (see below), whose sum is σ = 405768. Its totient is φ = 401520.

The previous prime is 403621. The next prime is 403649. The reversal of 403643 is 346304.

It is a happy number.

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 403643 - 2⁸ = 403387 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 403643.

It is not an unprimeable number, because it can be changed into a prime (403649) 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, 746 + ... + 1167.

It is an arithmetic number, because the mean of its divisors is an integer number (101442).

2⁴⁰³⁶⁴³ is an apocalyptic number.

403643 is a deficient number, since it is larger than the sum of its proper divisors (2125).

403643 is a wasteful number, since it uses less digits than its factorization.

403643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2124.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 403643 is about 635.3290486039. The cubic root of 403643 is about 73.9036364388.

Adding to 403643 its reverse (346304), we get a palindrome (749947).

The spelling of 403643 in words is "four hundred three thousand, six hundred forty-three".