509861982 has 32 divisors (see below), whose sum is σ = 1167581952. Its totient is φ = 145401984.

The previous prime is 509861927. The next prime is 509861987. The reversal of 509861982 is 289168905.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509861987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11878 + ... + 34070.

It is an arithmetic number, because the mean of its divisors is an integer number (36486936).

Almost surely, 2^509861982 is an apocalyptic number.

509861982 is an abundant number, since it is smaller than the sum of its proper divisors (657719970).

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

509861982 is a wasteful number, since it uses less digits than its factorization.

509861982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22752.

The product of its (nonzero) digits is 311040, while the sum is 48.

The square root of 509861982 is about 22580.1236046218. The cubic root of 509861982 is about 798.8848953576.

The spelling of 509861982 in words is "five hundred nine million, eight hundred sixty-one thousand, nine hundred eighty-two".