509698 has 16 divisors (see below), whose sum is σ = 892800. Its totient is φ = 218148.

The previous prime is 509693. The next prime is 509699. The reversal of 509698 is 896905.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is an alternating number because its digits alternate between odd and even.

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (509693) 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, 315 + ... + 1057.

It is an arithmetic number, because the mean of its divisors is an integer number (55800).

2⁵⁰⁹⁶⁹⁸ is an apocalyptic number.

509698 is a deficient number, since it is larger than the sum of its proper divisors (383102).

509698 is an equidigital number, since it uses as much as digits as its factorization.

509698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766 (or 752 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 509698 is about 713.9313692506. The cubic root of 509698 is about 79.8799240289.

The spelling of 509698 in words is "five hundred nine thousand, six hundred ninety-eight".