509898990 has 16 divisors (see below), whose sum is σ = 1223757648. Its totient is φ = 135973056.

The previous prime is 509898979. The next prime is 509898997. The reversal of 509898990 is 99898905.

It is a self number, because there is not a number n which added to its sum of digits gives 509898990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509898997) 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, 8498287 + ... + 8498346.

It is an arithmetic number, because the mean of its divisors is an integer number (76484853).

Almost surely, 2^509898990 is an apocalyptic number.

509898990 is an abundant number, since it is smaller than the sum of its proper divisors (713858658).

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

509898990 is a wasteful number, since it uses less digits than its factorization.

509898990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16996643.

The product of its (nonzero) digits is 2099520, while the sum is 57.

The square root of 509898990 is about 22580.9430715371. The cubic root of 509898990 is about 798.9042237366.

The spelling of 509898990 in words is "five hundred nine million, eight hundred ninety-eight thousand, nine hundred ninety".