509218946 has 32 divisors (see below), whose sum is σ = 808151040. Its totient is φ = 240299136.

The previous prime is 509218933. The next prime is 509218949. The reversal of 509218946 is 649812905.

It is a junction number, because it is equal to n+sod(n) for n = 509218897 and 509218906.

It is not an unprimeable number, because it can be changed into a prime (509218949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 537245 + ... + 538191.

It is an arithmetic number, because the mean of its divisors is an integer number (25254720).

Almost surely, 2^509218946 is an apocalyptic number.

509218946 is a deficient number, since it is larger than the sum of its proper divisors (298932094).

509218946 is a wasteful number, since it uses less digits than its factorization.

509218946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 509218946 is about 22565.8801290798. The cubic root of 509218946 is about 798.5489038664.

The spelling of 509218946 in words is "five hundred nine million, two hundred eighteen thousand, nine hundred forty-six".