168838509 has 16 divisors (see below), whose sum is σ = 272412288. Its totient is φ = 90803712.

The previous prime is 168838477. The next prime is 168838513. The reversal of 168838509 is 905838861.

It is not a de Polignac number, because 168838509 - 2⁵ = 168838477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168838519) 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, 236112 + ... + 236825.

It is an arithmetic number, because the mean of its divisors is an integer number (17025768).

Almost surely, 2^168838509 is an apocalyptic number.

It is an amenable number.

168838509 is a deficient number, since it is larger than the sum of its proper divisors (103573779).

168838509 is a wasteful number, since it uses less digits than its factorization.

168838509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472964.

The product of its (nonzero) digits is 414720, while the sum is 48.

The square root of 168838509 is about 12993.7873231787. The cubic root of 168838509 is about 552.7013212265.

The spelling of 168838509 in words is "one hundred sixty-eight million, eight hundred thirty-eight thousand, five hundred nine".