138134840 has 16 divisors (see below), whose sum is σ = 310803480. Its totient is φ = 55253920.

The previous prime is 138134827. The next prime is 138134851. The reversal of 138134840 is 48431831.

It is a junction number, because it is equal to n+sod(n) for n = 138134797 and 138134806.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1726646 + ... + 1726725.

Almost surely, 2^138134840 is an apocalyptic number.

138134840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138134840 is an abundant number, since it is smaller than the sum of its proper divisors (172668640).

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

138134840 is a wasteful number, since it uses less digits than its factorization.

138134840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3453382 (or 3453378 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 138134840 is about 11753.0778947474. The cubic root of 138134840 is about 516.9331810331.

The spelling of 138134840 in words is "one hundred thirty-eight million, one hundred thirty-four thousand, eight hundred forty".