168172938 has 24 divisors (see below), whose sum is σ = 365536548. Its totient is φ = 55878912.

The previous prime is 168172897. The next prime is 168172981. The reversal of 168172938 is 839271861.

It can be written as a sum of positive squares in 2 ways, for example, as 141205689 + 26967249 = 11883^2 + 5193^2 .

It is a junction number, because it is equal to n+sod(n) for n = 168172893 and 168172902.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 9031 + ... + 20442.

Almost surely, 2^168172938 is an apocalyptic number.

168172938 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

168172938 is an abundant number, since it is smaller than the sum of its proper divisors (197363610).

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

168172938 is a wasteful number, since it uses less digits than its factorization.

168172938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29798 (or 29795 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 168172938 is about 12968.1509090541. The cubic root of 168172938 is about 551.9741048029.

The spelling of 168172938 in words is "one hundred sixty-eight million, one hundred seventy-two thousand, nine hundred thirty-eight".