509949739 has 4 divisors (see below), whose sum is σ = 549176656. Its totient is φ = 470722824.

The previous prime is 509949733. The next prime is 509949743. The reversal of 509949739 is 937949905.

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

It is not a de Polignac number, because 509949739 - 2²³ = 501561131 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 509949739.

It is not an unprimeable number, because it can be changed into a prime (509949733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19613439 + ... + 19613464.

It is an arithmetic number, because the mean of its divisors is an integer number (137294164).

Almost surely, 2^509949739 is an apocalyptic number.

509949739 is a deficient number, since it is larger than the sum of its proper divisors (39226917).

509949739 is a wasteful number, since it uses less digits than its factorization.

509949739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39226916.

The product of its (nonzero) digits is 2755620, while the sum is 55.

The square root of 509949739 is about 22582.0667566102. The cubic root of 509949739 is about 798.9307271855.

The spelling of 509949739 in words is "five hundred nine million, nine hundred forty-nine thousand, seven hundred thirty-nine".