138561126 has 16 divisors (see below), whose sum is σ = 302315328. Its totient is φ = 41988200.

The previous prime is 138561121. The next prime is 138561149. The reversal of 138561126 is 621165831.

138561126 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138561121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1049640 + ... + 1049771.

It is an arithmetic number, because the mean of its divisors is an integer number (18894708).

Almost surely, 2^138561126 is an apocalyptic number.

138561126 is an abundant number, since it is smaller than the sum of its proper divisors (163754202).

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

138561126 is a wasteful number, since it uses less digits than its factorization.

138561126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2099427.

The product of its digits is 8640, while the sum is 33.

The square root of 138561126 is about 11771.1990043496. The cubic root of 138561126 is about 517.4643892507.

The spelling of 138561126 in words is "one hundred thirty-eight million, five hundred sixty-one thousand, one hundred twenty-six".