403540 has 12 divisors (see below), whose sum is σ = 847476. Its totient is φ = 161408.

The previous prime is 403537. The next prime is 403547. The reversal of 403540 is 45304.

It can be written as a sum of positive squares in 2 ways, for example, as 213444 + 190096 = 462^2 + 436^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (403547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10069 + ... + 10108.

It is an arithmetic number, because the mean of its divisors is an integer number (70623).

2⁴⁰³⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

403540 is an abundant number, since it is smaller than the sum of its proper divisors (443936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

403540 is a wasteful number, since it uses less digits than its factorization.

403540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20186 (or 20184 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 403540 is about 635.2479830743. The cubic root of 403540 is about 73.8973497597.

Adding to 403540 its reverse (45304), we get a palindrome (448844).

The spelling of 403540 in words is "four hundred three thousand, five hundred forty".