138023172 has 144 divisors (see below), whose sum is σ = 416287872. Its totient is φ = 37739520.

The previous prime is 138023159. The next prime is 138023177. The reversal of 138023172 is 271320831.

It is not an unprimeable number, because it can be changed into a prime (138023177) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1053547 + ... + 1053677.

It is an arithmetic number, because the mean of its divisors is an integer number (2890888).

Almost surely, 2^138023172 is an apocalyptic number.

138023172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138023172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208143936).

138023172 is an abundant number, since it is smaller than the sum of its proper divisors (278264700).

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

138023172 is a wasteful number, since it uses less digits than its factorization.

138023172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 138023172 is about 11748.3263488890. The cubic root of 138023172 is about 516.7938474747.

The spelling of 138023172 in words is "one hundred thirty-eight million, twenty-three thousand, one hundred seventy-two".