501103440 has 120 divisors (see below), whose sum is σ = 1686990240. Its totient is φ = 133300992.

The previous prime is 501103433. The next prime is 501103457. The reversal of 501103440 is 44301105.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×501103440² = 502209315159667200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 491251 + ... + 492269.

It is an arithmetic number, because the mean of its divisors is an integer number (14058252).

Almost surely, 2^501103440 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 501103440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (843495120).

501103440 is an abundant number, since it is smaller than the sum of its proper divisors (1185886800).

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

501103440 is a wasteful number, since it uses less digits than its factorization.

501103440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1721 (or 1712 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 501103440 is about 22385.3398455328. The cubic root of 501103440 is about 794.2839642738.

Adding to 501103440 its reverse (44301105), we get a palindrome (545404545).

The spelling of 501103440 in words is "five hundred one million, one hundred three thousand, four hundred forty".