138042168 has 32 divisors (see below), whose sum is σ = 376479360. Its totient is φ = 41830880.

The previous prime is 138042139. The next prime is 138042173. The reversal of 138042168 is 861240831.

It is a super-2 number, since 2×138042168² = 38111280292280448, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261180 + ... + 261707.

It is an arithmetic number, because the mean of its divisors is an integer number (11764980).

Almost surely, 2^138042168 is an apocalyptic number.

It is an amenable number.

138042168 is an abundant number, since it is smaller than the sum of its proper divisors (238437192).

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

138042168 is a wasteful number, since it uses less digits than its factorization.

138042168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522907 (or 522903 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 138042168 is about 11749.1347766548. The cubic root of 138042168 is about 516.8175550050.

Adding to 138042168 its reverse (861240831), we get a palindrome (999282999).

The spelling of 138042168 in words is "one hundred thirty-eight million, forty-two thousand, one hundred sixty-eight".