509825979 has 24 divisors (see below), whose sum is σ = 795976272. Its totient is φ = 312586560.

The previous prime is 509825951. The next prime is 509825989. The reversal of 509825979 is 979528905.

509825979 is a `hidden beast` number, since 509 + 82 + 59 + 7 + 9 = 666.

It is not a de Polignac number, because 509825979 - 2⁹ = 509825467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (509825989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24544 + ... + 40274.

It is an arithmetic number, because the mean of its divisors is an integer number (33165678).

Almost surely, 2^509825979 is an apocalyptic number.

509825979 is a deficient number, since it is larger than the sum of its proper divisors (286150293).

509825979 is a wasteful number, since it uses less digits than its factorization.

509825979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16027 (or 16024 counting only the distinct ones).

The product of its (nonzero) digits is 2041200, while the sum is 54.

The square root of 509825979 is about 22579.3263628479. The cubic root of 509825979 is about 798.8660909681.

The spelling of 509825979 in words is "five hundred nine million, eight hundred twenty-five thousand, nine hundred seventy-nine".