139391268 has 12 divisors (see below), whose sum is σ = 325246320. Its totient is φ = 46463752.

The previous prime is 139391249. The next prime is 139391269. The reversal of 139391268 is 862193931.

139391268 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (139391269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5807958 + ... + 5807981.

It is an arithmetic number, because the mean of its divisors is an integer number (27103860).

Almost surely, 2^139391268 is an apocalyptic number.

It is an amenable number.

139391268 is an abundant number, since it is smaller than the sum of its proper divisors (185855052).

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

139391268 is a wasteful number, since it uses less digits than its factorization.

139391268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11615946 (or 11615944 counting only the distinct ones).

The product of its digits is 69984, while the sum is 42.

The square root of 139391268 is about 11806.4079211249. The cubic root of 139391268 is about 518.4957364672.

The spelling of 139391268 in words is "one hundred thirty-nine million, three hundred ninety-one thousand, two hundred sixty-eight".