505155440 has 80 divisors (see below), whose sum is σ = 1231046208. Its totient is φ = 192411648.

The previous prime is 505155421. The next prime is 505155449. The reversal of 505155440 is 44551505.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505155449) 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, 538652 + ... + 539588.

Almost surely, 2^505155440 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 505155440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (615523104).

505155440 is an abundant number, since it is smaller than the sum of its proper divisors (725890768).

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

505155440 is a wasteful number, since it uses less digits than its factorization.

505155440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266 (or 1260 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 29.

The square root of 505155440 is about 22475.6632827599. The cubic root of 505155440 is about 796.4191205428.

It can be divided in two parts, 50515 and 5440, that added together give a palindrome (55955).

The spelling of 505155440 in words is "five hundred five million, one hundred fifty-five thousand, four hundred forty".