138643110 has 64 divisors (see below), whose sum is σ = 373248000. Its totient is φ = 36618336.

The previous prime is 138643093. The next prime is 138643111. The reversal of 138643110 is 11346831.

138643110 is a `hidden beast` number, since 1 + 3 + 8 + 643 + 1 + 10 = 666.

138643110 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138643111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26491 + ... + 31289.

It is an arithmetic number, because the mean of its divisors is an integer number (5832000).

Almost surely, 2^138643110 is an apocalyptic number.

138643110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 138643110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186624000).

138643110 is an abundant number, since it is smaller than the sum of its proper divisors (234604890).

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

138643110 is a wasteful number, since it uses less digits than its factorization.

138643110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4922 (or 4916 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 138643110 is about 11774.6808873956. The cubic root of 138643110 is about 517.5664270957.

Adding to 138643110 its reverse (11346831), we get a palindrome (149989941).

The spelling of 138643110 in words is "one hundred thirty-eight million, six hundred forty-three thousand, one hundred ten".