139868508 has 96 divisors (see below), whose sum is σ = 372556800. Its totient is φ = 40529664.

The previous prime is 139868501. The next prime is 139868539. The reversal of 139868508 is 805868931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139868501) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 194173 + ... + 194891.

It is an arithmetic number, because the mean of its divisors is an integer number (3880800).

Almost surely, 2^139868508 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 139868508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186278400).

139868508 is an abundant number, since it is smaller than the sum of its proper divisors (232688292).

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

139868508 is a wasteful number, since it uses less digits than its factorization.

139868508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811 (or 809 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 48.

The square root of 139868508 is about 11826.6017097051. The cubic root of 139868508 is about 519.0867946362.

The spelling of 139868508 in words is "one hundred thirty-nine million, eight hundred sixty-eight thousand, five hundred eight".