167994138 has 64 divisors (see below), whose sum is σ = 374419584. Its totient is φ = 49920000.

The previous prime is 167994137. The next prime is 167994161. The reversal of 167994138 is 831499761.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (167994131) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 418738 + ... + 419138.

It is an arithmetic number, because the mean of its divisors is an integer number (5850306).

Almost surely, 2^167994138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 167994138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187209792).

167994138 is an abundant number, since it is smaller than the sum of its proper divisors (206425446).

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

167994138 is a wasteful number, since it uses less digits than its factorization.

167994138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591.

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

The square root of 167994138 is about 12961.2552632837. The cubic root of 167994138 is about 551.7784174184.

The spelling of 167994138 in words is "one hundred sixty-seven million, nine hundred ninety-four thousand, one hundred thirty-eight".