403404040 has 32 divisors (see below), whose sum is σ = 977480280. Its totient is φ = 148948992.

The previous prime is 403404013. The next prime is 403404047. The reversal of 403404040 is 40404304.

It can be written as a sum of positive squares in 4 ways, for example, as 361076004 + 42328036 = 19002^2 + 6506^2 .

It is a junction number, because it is equal to n+sod(n) for n = 403403999 and 403404017.

It is not an unprimeable number, because it can be changed into a prime (403404047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 387369 + ... + 388408.

Almost surely, 2^403404040 is an apocalyptic number.

403404040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

403404040 is an abundant number, since it is smaller than the sum of its proper divisors (574076240).

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

403404040 is a wasteful number, since it uses less digits than its factorization.

403404040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775801 (or 775797 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 403404040 is about 20084.9207118176. The cubic root of 403404040 is about 738.8904970495.

Adding to 403404040 its reverse (40404304), we get a palindrome (443808344).

The spelling of 403404040 in words is "four hundred three million, four hundred four thousand, forty".