509138 has 16 divisors (see below), whose sum is σ = 895104. Its totient is φ = 212640.

The previous prime is 509137. The next prime is 509147. The reversal of 509138 is 831905.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 509138.

It is not an unprimeable number, because it can be changed into a prime (509137) 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, 131 + ... + 1017.

It is an arithmetic number, because the mean of its divisors is an integer number (55944).

2⁵⁰⁹¹³⁸ is an apocalyptic number.

509138 is a deficient number, since it is larger than the sum of its proper divisors (385966).

509138 is a wasteful number, since it uses less digits than its factorization.

509138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 509138 is about 713.5390669052. The cubic root of 509138 is about 79.8506588889.

The spelling of 509138 in words is "five hundred nine thousand, one hundred thirty-eight".