505131840 has 84 divisors (see below), whose sum is σ = 1737452964. Its totient is φ = 134701056.

The previous prime is 505131811. The next prime is 505131841. The reversal of 505131840 is 48131505.

It can be written as a sum of positive squares in 2 ways, for example, as 123476544 + 381655296 = 11112^2 + 19536^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505131841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84817 + ... + 90576.

Almost surely, 2^505131840 is an apocalyptic number.

It is an amenable number.

505131840 is an abundant number, since it is smaller than the sum of its proper divisors (1232321124).

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

505131840 is a wasteful number, since it uses less digits than its factorization.

505131840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175416 (or 175403 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 505131840 is about 22475.1382643133. The cubic root of 505131840 is about 796.4067179023.

The spelling of 505131840 in words is "five hundred five million, one hundred thirty-one thousand, eight hundred forty".