509494 has 4 divisors (see below), whose sum is σ = 764244. Its totient is φ = 254746.

The previous prime is 509477. The next prime is 509513. The reversal of 509494 is 494905.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 494905 = 5 ⋅98981.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is a congruent number.

It is an unprimeable number.

509494 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127372 + ... + 127375.

It is an arithmetic number, because the mean of its divisors is an integer number (191061).

2⁵⁰⁹⁴⁹⁴ is an apocalyptic number.

509494 is a deficient number, since it is larger than the sum of its proper divisors (254750).

509494 is a wasteful number, since it uses less digits than its factorization.

509494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254749.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 509494 is about 713.7884840763. The cubic root of 509494 is about 79.8692656396.

The spelling of 509494 in words is "five hundred nine thousand, four hundred ninety-four".