138525140 has 24 divisors (see below), whose sum is σ = 313280520. Its totient is φ = 51147648.

The previous prime is 138525139. The next prime is 138525169. The reversal of 138525140 is 41525831.

It can be written as a sum of positive squares in 4 ways, for example, as 274576 + 138250564 = 524^2 + 11758^2 .

It is a plaindrome in base 14.

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, 266135 + ... + 266654.

It is an arithmetic number, because the mean of its divisors is an integer number (13053355).

Almost surely, 2^138525140 is an apocalyptic number.

138525140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138525140 is an abundant number, since it is smaller than the sum of its proper divisors (174755380).

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

138525140 is a wasteful number, since it uses less digits than its factorization.

138525140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532811 (or 532809 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 138525140 is about 11769.6703437267. The cubic root of 138525140 is about 517.4195881188.

The spelling of 138525140 in words is "one hundred thirty-eight million, five hundred twenty-five thousand, one hundred forty".