138142472 has 32 divisors (see below), whose sum is σ = 281164800. Its totient is φ = 63249984.

The previous prime is 138142471. The next prime is 138142517. The reversal of 138142472 is 274241831.

It is not an unprimeable number, because it can be changed into a prime (138142471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7979 + ... + 18437.

It is an arithmetic number, because the mean of its divisors is an integer number (8786400).

Almost surely, 2^138142472 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 138142472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140582400).

138142472 is an abundant number, since it is smaller than the sum of its proper divisors (143022328).

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

138142472 is a wasteful number, since it uses less digits than its factorization.

138142472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10605 (or 10601 counting only the distinct ones).

The product of its digits is 10752, while the sum is 32.

The square root of 138142472 is about 11753.4025711706. The cubic root of 138142472 is about 516.9427011063.

The spelling of 138142472 in words is "one hundred thirty-eight million, one hundred forty-two thousand, four hundred seventy-two".