138533140 has 24 divisors (see below), whose sum is σ = 303569280. Its totient is φ = 53003808.

The previous prime is 138533089. The next prime is 138533173. The reversal of 138533140 is 41335831.

It is a junction number, because it is equal to n+sod(n) for n = 138533099 and 138533108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150120 + ... + 151039.

It is an arithmetic number, because the mean of its divisors is an integer number (12648720).

Almost surely, 2^138533140 is an apocalyptic number.

138533140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138533140 is an abundant number, since it is smaller than the sum of its proper divisors (165036140).

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

138533140 is a wasteful number, since it uses less digits than its factorization.

138533140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301191 (or 301189 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 138533140 is about 11770.0101954076. The cubic root of 138533140 is about 517.4295484698.

Adding to 138533140 its reverse (41335831), we get a palindrome (179868971).

The spelling of 138533140 in words is "one hundred thirty-eight million, five hundred thirty-three thousand, one hundred forty".