505399944 has 128 divisors (see below), whose sum is σ = 1519534080. Its totient is φ = 137030400.

The previous prime is 505399933. The next prime is 505399963. The reversal of 505399944 is 449993505.

It is a junction number, because it is equal to n+sod(n) for n = 505399893 and 505399902.

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, 275109 + ... + 276939.

It is an arithmetic number, because the mean of its divisors is an integer number (11871360).

Almost surely, 2^505399944 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 505399944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (759767040).

505399944 is an abundant number, since it is smaller than the sum of its proper divisors (1014134136).

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

505399944 is a wasteful number, since it uses less digits than its factorization.

505399944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1931 (or 1927 counting only the distinct ones).

The product of its (nonzero) digits is 874800, while the sum is 48.

The square root of 505399944 is about 22481.1019302880. The cubic root of 505399944 is about 796.5475933761.

The spelling of 505399944 in words is "five hundred five million, three hundred ninety-nine thousand, nine hundred forty-four".