139181568 has 160 divisors (see below), whose sum is σ = 398069760. Its totient is φ = 43130880.

The previous prime is 139181561. The next prime is 139181591. The reversal of 139181568 is 865181931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139181561) 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 15 ways as a sum of consecutive naturals, for example, 1761753 + ... + 1761831.

It is an arithmetic number, because the mean of its divisors is an integer number (2487936).

Almost surely, 2^139181568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139181568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199034880).

139181568 is an abundant number, since it is smaller than the sum of its proper divisors (258888192).

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

139181568 is an equidigital number, since it uses as much as digits as its factorization.

139181568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168 (or 152 counting only the distinct ones).

The product of its digits is 51840, while the sum is 42.

The square root of 139181568 is about 11797.5238079861. The cubic root of 139181568 is about 518.2355979214.

The spelling of 139181568 in words is "one hundred thirty-nine million, one hundred eighty-one thousand, five hundred sixty-eight".