138171672 has 48 divisors (see below), whose sum is σ = 390489840. Its totient is φ = 44054208.

The previous prime is 138171661. The next prime is 138171673. The reversal of 138171672 is 276171831.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138171673) 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 11 ways as a sum of consecutive naturals, for example, 40063 + ... + 43374.

It is an arithmetic number, because the mean of its divisors is an integer number (8135205).

Almost surely, 2^138171672 is an apocalyptic number.

138171672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138171672 is an abundant number, since it is smaller than the sum of its proper divisors (252318168).

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

138171672 is a wasteful number, since it uses less digits than its factorization.

138171672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83472 (or 83465 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 138171672 is about 11754.6446990115. The cubic root of 138171672 is about 516.9791216298.

The spelling of 138171672 in words is "one hundred thirty-eight million, one hundred seventy-one thousand, six hundred seventy-two".