167991438 has 16 divisors (see below), whose sum is σ = 341491536. Its totient is φ = 55079040.

The previous prime is 167991401. The next prime is 167991451. The reversal of 167991438 is 834199761.

It is a happy number.

167991438 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×167991438² = 56442246482615688, which contains 22 as substring.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 229131 + ... + 229862.

It is an arithmetic number, because the mean of its divisors is an integer number (21343221).

Almost surely, 2^167991438 is an apocalyptic number.

167991438 is an abundant number, since it is smaller than the sum of its proper divisors (173500098).

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

167991438 is a wasteful number, since it uses less digits than its factorization.

167991438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459059.

The product of its digits is 326592, while the sum is 48.

The square root of 167991438 is about 12961.1511062868. The cubic root of 167991438 is about 551.7754613436.

The spelling of 167991438 in words is "one hundred sixty-seven million, nine hundred ninety-one thousand, four hundred thirty-eight".