168918906 has 48 divisors (see below), whose sum is σ = 369550944. Its totient is φ = 51169248.

The previous prime is 168918889. The next prime is 168918913. The reversal of 168918906 is 609819861.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 486625 + ... + 486971.

It is an arithmetic number, because the mean of its divisors is an integer number (7698978).

Almost surely, 2^168918906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 168918906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184775472).

168918906 is an abundant number, since it is smaller than the sum of its proper divisors (200632038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

168918906 is a wasteful number, since it uses less digits than its factorization.

168918906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 168918906 is about 12996.8806257502. The cubic root of 168918906 is about 552.7890351752.

The spelling of 168918906 in words is "one hundred sixty-eight million, nine hundred eighteen thousand, nine hundred six".