509869798 has 4 divisors (see below), whose sum is σ = 764804700. Its totient is φ = 254934898.

The previous prime is 509869783. The next prime is 509869813. The reversal of 509869798 is 897968905.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (509869783) and next prime (509869813).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127467448 + ... + 127467451.

It is an arithmetic number, because the mean of its divisors is an integer number (191201175).

Almost surely, 2^509869798 is an apocalyptic number.

509869798 is a deficient number, since it is larger than the sum of its proper divisors (254934902).

509869798 is a wasteful number, since it uses less digits than its factorization.

509869798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254934901.

The product of its (nonzero) digits is 9797760, while the sum is 61.

The square root of 509869798 is about 22580.2966765275. The cubic root of 509869798 is about 798.8889775423. Note that the first 3 decimals are identical.

The spelling of 509869798 in words is "five hundred nine million, eight hundred sixty-nine thousand, seven hundred ninety-eight".