509899821 has 8 divisors (see below), whose sum is σ = 696448704. Its totient is φ = 331642080.

The previous prime is 509899801. The next prime is 509899843. The reversal of 509899821 is 128998905.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 509899821 - 2⁷ = 509899693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509899801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2072641 + ... + 2072886.

It is an arithmetic number, because the mean of its divisors is an integer number (87056088).

Almost surely, 2^509899821 is an apocalyptic number.

It is an amenable number.

509899821 is a deficient number, since it is larger than the sum of its proper divisors (186548883).

509899821 is a wasteful number, since it uses less digits than its factorization.

509899821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4145571.

The product of its (nonzero) digits is 466560, while the sum is 51.

The square root of 509899821 is about 22580.9614720011. The cubic root of 509899821 is about 798.9046577370.

The spelling of 509899821 in words is "five hundred nine million, eight hundred ninety-nine thousand, eight hundred twenty-one".