168438646 has 8 divisors (see below), whose sum is σ = 252798624. Its totient is φ = 84172440.

The previous prime is 168438631. The next prime is 168438649. The reversal of 168438646 is 646834861.

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

It is a junction number, because it is equal to n+sod(n) for n = 168438596 and 168438605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168438649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18765 + ... + 26248.

It is an arithmetic number, because the mean of its divisors is an integer number (31599828).

Almost surely, 2^168438646 is an apocalyptic number.

168438646 is a deficient number, since it is larger than the sum of its proper divisors (84359978).

168438646 is a wasteful number, since it uses less digits than its factorization.

168438646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46886.

The product of its digits is 663552, while the sum is 46.

The square root of 168438646 is about 12978.3915028019. The cubic root of 168438646 is about 552.2646524646.

The spelling of 168438646 in words is "one hundred sixty-eight million, four hundred thirty-eight thousand, six hundred forty-six".