509690 has 8 divisors (see below), whose sum is σ = 917460. Its totient is φ = 203872.

The previous prime is 509689. The next prime is 509693. The reversal of 509690 is 96905.

It can be written as a sum of positive squares in 2 ways, for example, as 474721 + 34969 = 689^2 + 187^2 .

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

It is a super-2 number, since 2×509690² = 519567792200, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (509693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25475 + ... + 25494.

2⁵⁰⁹⁶⁹⁰ is an apocalyptic number.

509690 is a deficient number, since it is larger than the sum of its proper divisors (407770).

509690 is a wasteful number, since it uses less digits than its factorization.

509690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50976.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 509690 is about 713.9257664491. The cubic root of 509690 is about 79.8795061064.

The spelling of 509690 in words is "five hundred nine thousand, six hundred ninety".