509868905 has 16 divisors (see below), whose sum is σ = 753037824. Its totient is φ = 322729920.

The previous prime is 509868901. The next prime is 509868941.

It is a happy number.

509868905 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 509868905 - 2² = 509868901 is a prime.

It is not an unprimeable number, because it can be changed into a prime (509868901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 559841 + ... + 560750.

It is an arithmetic number, because the mean of its divisors is an integer number (47064864).

Almost surely, 2^509868905 is an apocalyptic number.

It is an amenable number.

509868905 is a deficient number, since it is larger than the sum of its proper divisors (243168919).

509868905 is a wasteful number, since it uses less digits than its factorization.

509868905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120616.

The product of its (nonzero) digits is 777600, while the sum is 50.

The square root of 509868905 is about 22580.2769026423. The cubic root of 509868905 is about 798.8885111433. Note that the first 3 decimals are identical.

The spelling of 509868905 in words is "five hundred nine million, eight hundred sixty-eight thousand, nine hundred five".