138152740 has 96 divisors (see below), whose sum is σ = 334430208. Its totient is φ = 47472000.

The previous prime is 138152717. The next prime is 138152741. The reversal of 138152740 is 47251831.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (138152741) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 320325 + ... + 320755.

It is an arithmetic number, because the mean of its divisors is an integer number (3483648).

Almost surely, 2^138152740 is an apocalyptic number.

138152740 is a gapful number since it is divisible by the number (10) 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 138152740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167215104).

138152740 is an abundant number, since it is smaller than the sum of its proper divisors (196277468).

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

138152740 is a wasteful number, since it uses less digits than its factorization.

138152740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529 (or 527 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 138152740 is about 11753.8393727326. The cubic root of 138152740 is about 516.9555087439.

Subtracting from 138152740 its reverse (47251831), we obtain a palindrome (90900909).

The spelling of 138152740 in words is "one hundred thirty-eight million, one hundred fifty-two thousand, seven hundred forty".