138890140 has 12 divisors (see below), whose sum is σ = 291669336. Its totient is φ = 55556048.

The previous prime is 138890113. The next prime is 138890159. The reversal of 138890140 is 41098831.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 138890096 and 138890105.

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, 3472234 + ... + 3472273.

It is an arithmetic number, because the mean of its divisors is an integer number (24305778).

Almost surely, 2^138890140 is an apocalyptic number.

138890140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138890140 is an abundant number, since it is smaller than the sum of its proper divisors (152779196).

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

138890140 is a wasteful number, since it uses less digits than its factorization.

138890140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6944516 (or 6944514 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 138890140 is about 11785.1660998053. The cubic root of 138890140 is about 517.8736393182.

The spelling of 138890140 in words is "one hundred thirty-eight million, eight hundred ninety thousand, one hundred forty".