167921138 has 90 divisors (see below), whose sum is σ = 343102893. Its totient is φ = 61575360.

The previous prime is 167921123. The next prime is 167921167. The reversal of 167921138 is 831129761.

It can be written as a sum of positive squares in 2 ways, for example, as 153685609 + 14235529 = 12397^2 + 3773^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=9163.

It is a Curzon number.

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 44 ways as a sum of consecutive naturals, for example, 9877706 + ... + 9877722.

Almost surely, 2^167921138 is an apocalyptic number.

167921138 is an abundant number, since it is smaller than the sum of its proper divisors (175181755).

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

167921138 is an equidigital number, since it uses as much as digits as its factorization.

167921138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86 (or 37 counting only the distinct ones).

The product of its digits is 18144, while the sum is 38.

The square root of 167921138 is about 12958.4388720247. The cubic root of 167921138 is about 551.6984827637.

The spelling of 167921138 in words is "one hundred sixty-seven million, nine hundred twenty-one thousand, one hundred thirty-eight".