138163732 has 36 divisors (see below), whose sum is σ = 284854080. Its totient is φ = 58456944.

The previous prime is 138163721. The next prime is 138163741. The reversal of 138163732 is 237361831.

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 11 ways as a sum of consecutive naturals, for example, 11023 + ... + 19945.

Almost surely, 2^138163732 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138163732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142427040).

138163732 is an abundant number, since it is smaller than the sum of its proper divisors (146690348).

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

138163732 is a wasteful number, since it uses less digits than its factorization.

138163732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9020 (or 9011 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 138163732 is about 11754.3069553249. The cubic root of 138163732 is about 516.9692187488.

The spelling of 138163732 in words is "one hundred thirty-eight million, one hundred sixty-three thousand, seven hundred thirty-two".