509797929942 has 144 divisors (see below), whose sum is σ = 1342689384192. Its totient is φ = 136913898240.

The previous prime is 509797929931. The next prime is 509797929967. The reversal of 509797929942 is 249929797905.

509797929942 is a `hidden beast` number, since 509 + 7 + 9 + 7 + 9 + 29 + 94 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 29960217 + ... + 29977227.

Almost surely, 2^509797929942 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 509797929942, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (671344692096).

509797929942 is an abundant number, since it is smaller than the sum of its proper divisors (832891454250).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

509797929942 is a wasteful number, since it uses less digits than its factorization.

509797929942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17883 (or 17863 counting only the distinct ones).

The product of its (nonzero) digits is 231472080, while the sum is 72.

The spelling of 509797929942 in words is "five hundred nine billion, seven hundred ninety-seven million, nine hundred twenty-nine thousand, nine hundred forty-two".