509139447 has 8 divisors (see below), whose sum is σ = 714581760. Its totient is φ = 321561720.

The previous prime is 509139427. The next prime is 509139461. The reversal of 509139447 is 744931905.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 509139447 - 2⁶ = 509139383 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 509139399 and 509139408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509139427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4466079 + ... + 4466192.

It is an arithmetic number, because the mean of its divisors is an integer number (89322720).

Almost surely, 2^509139447 is an apocalyptic number.

509139447 is a gapful number since it is divisible by the number (57) formed by its first and last digit.

509139447 is a deficient number, since it is larger than the sum of its proper divisors (205442313).

509139447 is a wasteful number, since it uses less digits than its factorization.

509139447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8932293.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 509139447 is about 22564.1185735229. The cubic root of 509139447 is about 798.5073453556.

The spelling of 509139447 in words is "five hundred nine million, one hundred thirty-nine thousand, four hundred forty-seven".