138236140 has 48 divisors (see below), whose sum is σ = 332607744. Its totient is φ = 47275200.

The previous prime is 138236123. The next prime is 138236159. The reversal of 138236140 is 41632831.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 138236099 and 138236108.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67735 + ... + 69745.

It is an arithmetic number, because the mean of its divisors is an integer number (6929328).

Almost surely, 2^138236140 is an apocalyptic number.

138236140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138236140 is an abundant number, since it is smaller than the sum of its proper divisors (194371604).

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

138236140 is a wasteful number, since it uses less digits than its factorization.

138236140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2518 (or 2516 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 138236140 is about 11757.3866143799. The cubic root of 138236140 is about 517.0595129946.

Adding to 138236140 its reverse (41632831), we get a palindrome (179868971).

The spelling of 138236140 in words is "one hundred thirty-eight million, two hundred thirty-six thousand, one hundred forty".