509398 has 4 divisors (see below), whose sum is σ = 764100. Its totient is φ = 254698.

The previous prime is 509393. The next prime is 509413. The reversal of 509398 is 893905.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 893905 = 5 ⋅178781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127348 + ... + 127351.

It is an arithmetic number, because the mean of its divisors is an integer number (191025).

2⁵⁰⁹³⁹⁸ is an apocalyptic number.

509398 is the 382-nd centered heptagonal number.

509398 is a deficient number, since it is larger than the sum of its proper divisors (254702).

509398 is a wasteful number, since it uses less digits than its factorization.

509398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254701.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 509398 is about 713.7212340963. The cubic root of 509398 is about 79.8642489426.

The spelling of 509398 in words is "five hundred nine thousand, three hundred ninety-eight".