505840649 has 16 divisors (see below), whose sum is σ = 538686720. Its totient is φ = 474190080.

The previous prime is 505840631. The next prime is 505840669. The reversal of 505840649 is 946048505.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 505840649 - 2¹² = 505836553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505840669) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 177137 + ... + 179969.

It is an arithmetic number, because the mean of its divisors is an integer number (33667920).

Almost surely, 2^505840649 is an apocalyptic number.

It is an amenable number.

505840649 is a deficient number, since it is larger than the sum of its proper divisors (32846071).

505840649 is a wasteful number, since it uses less digits than its factorization.

505840649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3040.

The product of its (nonzero) digits is 172800, while the sum is 41.

The square root of 505840649 is about 22490.9014714840. The cubic root of 505840649 is about 796.7790539749.

The spelling of 505840649 in words is "five hundred five million, eight hundred forty thousand, six hundred forty-nine".