403403540 has 72 divisors (see below), whose sum is σ = 913514112. Its totient is φ = 149578240.

The previous prime is 403403537. The next prime is 403403549. The reversal of 403403540 is 45304304.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (403403549) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 409889 + ... + 410871.

It is an arithmetic number, because the mean of its divisors is an integer number (12687696).

Almost surely, 2^403403540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 403403540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (456757056).

403403540 is an abundant number, since it is smaller than the sum of its proper divisors (510110572).

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

403403540 is a wasteful number, since it uses less digits than its factorization.

403403540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097 (or 1078 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 23.

The square root of 403403540 is about 20084.9082646648. The cubic root of 403403540 is about 738.8901917762.

Adding to 403403540 its reverse (45304304), we get a palindrome (448707844).

The spelling of 403403540 in words is "four hundred three million, four hundred three thousand, five hundred forty".