509428 has 12 divisors (see below), whose sum is σ = 938560. Its totient is φ = 241272.

The previous prime is 509417. The next prime is 509429. The reversal of 509428 is 824905.

It is a happy number.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 509396 and 509405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509429) by changing a digit.

509428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3276 + ... + 3427.

2⁵⁰⁹⁴²⁸ is an apocalyptic number.

It is an amenable number.

509428 is a deficient number, since it is larger than the sum of its proper divisors (429132).

509428 is a wasteful number, since it uses less digits than its factorization.

509428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6726 (or 6724 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 509428 is about 713.7422503958. The cubic root of 509428 is about 79.8658167281.

The spelling of 509428 in words is "five hundred nine thousand, four hundred twenty-eight".