505021440 has 528 divisors, whose sum is σ = 2083420224. Its totient is φ = 103219200.

The previous prime is 505021357. The next prime is 505021453. The reversal of 505021440 is 44120505.

It is a tau number, because it is divible by the number of its divisors (528).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8279010 + ... + 8279070.

Almost surely, 2^505021440 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 505021440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1041710112).

505021440 is an abundant number, since it is smaller than the sum of its proper divisors (1578398784).

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

505021440 is a wasteful number, since it uses less digits than its factorization.

505021440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 505021440 is about 22472.6820829201. The cubic root of 505021440 is about 796.3486936395.

Adding to 505021440 its reverse (44120505), we get a palindrome (549141945).

The spelling of 505021440 in words is "five hundred five million, twenty-one thousand, four hundred forty".