505236440 has 64 divisors (see below), whose sum is σ = 1170288000. Its totient is φ = 196188160.

The previous prime is 505236437. The next prime is 505236449. The reversal of 505236440 is 44632505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505236449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 391316 + ... + 392604.

It is an arithmetic number, because the mean of its divisors is an integer number (18285750).

Almost surely, 2^505236440 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 505236440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (585144000).

505236440 is an abundant number, since it is smaller than the sum of its proper divisors (665051560).

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

505236440 is a wasteful number, since it uses less digits than its factorization.

505236440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580 (or 1576 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 505236440 is about 22477.4651595770. The cubic root of 505236440 is about 796.4616859896.

Adding to 505236440 its reverse (44632505), we get a palindrome (549868945).

The spelling of 505236440 in words is "five hundred five million, two hundred thirty-six thousand, four hundred forty".