168138946 has 8 divisors (see below), whose sum is σ = 252270144. Its totient is φ = 84048900.

The previous prime is 168138941. The next prime is 168138973. The reversal of 168138946 is 649831861.

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 = 168138896 and 168138905.

It is not an unprimeable number, because it can be changed into a prime (168138941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3771 + ... + 18721.

It is an arithmetic number, because the mean of its divisors is an integer number (31533768).

Almost surely, 2^168138946 is an apocalyptic number.

168138946 is a deficient number, since it is larger than the sum of its proper divisors (84131198).

168138946 is a wasteful number, since it uses less digits than its factorization.

168138946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20576.

The product of its digits is 248832, while the sum is 46.

The square root of 168138946 is about 12966.8402473386. The cubic root of 168138946 is about 551.9369129925.

The spelling of 168138946 in words is "one hundred sixty-eight million, one hundred thirty-eight thousand, nine hundred forty-six".