505420340 has 24 divisors (see below), whose sum is σ = 1062285000. Its totient is φ = 201996288.

The previous prime is 505420337. The next prime is 505420361. The reversal of 505420340 is 43024505.

It can be written as a sum of positive squares in 4 ways, for example, as 40500496 + 464919844 = 6364^2 + 21562^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14864 + ... + 35096.

It is an arithmetic number, because the mean of its divisors is an integer number (44261875).

Almost surely, 2^505420340 is an apocalyptic number.

It is an amenable number.

505420340 is an abundant number, since it is smaller than the sum of its proper divisors (556864660).

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

505420340 is a wasteful number, since it uses less digits than its factorization.

505420340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21491 (or 21489 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 505420340 is about 22481.5555511624. Note that the first 5 decimals coincide. The cubic root of 505420340 is about 796.5583084321.

Adding to 505420340 its reverse (43024505), we get a palindrome (548444845).

The spelling of 505420340 in words is "five hundred five million, four hundred twenty thousand, three hundred forty".