501226440 has 128 divisors (see below), whose sum is σ = 1766620800. Its totient is φ = 112158720.

The previous prime is 501226433. The next prime is 501226463. The reversal of 501226440 is 44622105.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 501226440.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2556 + ... + 31764.

It is an arithmetic number, because the mean of its divisors is an integer number (13801725).

Almost surely, 2^501226440 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 501226440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (883310400).

501226440 is an abundant number, since it is smaller than the sum of its proper divisors (1265394360).

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

501226440 is a wasteful number, since it uses less digits than its factorization.

501226440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29247 (or 29243 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 501226440 is about 22388.0870107296. The cubic root of 501226440 is about 794.3489468220.

Adding to 501226440 its reverse (44622105), we get a palindrome (545848545).

The spelling of 501226440 in words is "five hundred one million, two hundred twenty-six thousand, four hundred forty".