509406623 has 4 divisors (see below), whose sum is σ = 555716328. Its totient is φ = 463096920.

The previous prime is 509406617. The next prime is 509406641. The reversal of 509406623 is 326604905.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 509406623 - 2⁸ = 509406367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509406223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23154836 + ... + 23154857.

It is an arithmetic number, because the mean of its divisors is an integer number (138929082).

Almost surely, 2^509406623 is an apocalyptic number.

509406623 is a deficient number, since it is larger than the sum of its proper divisors (46309705).

509406623 is a wasteful number, since it uses less digits than its factorization.

509406623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46309704.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 509406623 is about 22570.0381701051. The cubic root of 509406623 is about 798.6469958272.

The spelling of 509406623 in words is "five hundred nine million, four hundred six thousand, six hundred twenty-three".