509940859 has 4 divisors (see below), whose sum is σ = 509990400. Its totient is φ = 509891320.

The previous prime is 509940853. The next prime is 509940869. The reversal of 509940859 is 958049905.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509940859 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509940853) 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, 2884 + ... + 32065.

It is an arithmetic number, because the mean of its divisors is an integer number (127497600).

Almost surely, 2^509940859 is an apocalyptic number.

509940859 is a deficient number, since it is larger than the sum of its proper divisors (49541).

509940859 is a wasteful number, since it uses less digits than its factorization.

509940859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49540.

The product of its (nonzero) digits is 583200, while the sum is 49.

The square root of 509940859 is about 22581.8701395611. The cubic root of 509940859 is about 798.9260897703.

The spelling of 509940859 in words is "five hundred nine million, nine hundred forty thousand, eight hundred fifty-nine".