501330440 has 32 divisors (see below), whose sum is σ = 1214763480. Its totient is φ = 185106432.

The previous prime is 501330433. The next prime is 501330443. The reversal of 501330440 is 44033105.

It can be written as a sum of positive squares in 4 ways, for example, as 254274916 + 247055524 = 15946^2 + 15718^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (501330443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 481529 + ... + 482568.

Almost surely, 2^501330440 is an apocalyptic number.

It is an amenable number.

501330440 is an abundant number, since it is smaller than the sum of its proper divisors (713433040).

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

501330440 is a wasteful number, since it uses less digits than its factorization.

501330440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964121 (or 964117 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 501330440 is about 22390.4095540926. The cubic root of 501330440 is about 794.4038831214.

Adding to 501330440 its reverse (44033105), we get a palindrome (545363545).

It can be divided in two parts, 5013 and 30440, that added together give a palindrome (35453).

The spelling of 501330440 in words is "five hundred one million, three hundred thirty thousand, four hundred forty".