139688078 has 8 divisors (see below), whose sum is σ = 211454760. Its totient is φ = 69203160.

The previous prime is 139688033. The next prime is 139688093. The reversal of 139688078 is 870886931.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 320168 + ... + 320603.

It is an arithmetic number, because the mean of its divisors is an integer number (26431845).

Almost surely, 2^139688078 is an apocalyptic number.

139688078 is a deficient number, since it is larger than the sum of its proper divisors (71766682).

139688078 is a wasteful number, since it uses less digits than its factorization.

139688078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640882.

The product of its (nonzero) digits is 580608, while the sum is 50.

The square root of 139688078 is about 11818.9711058112. The cubic root of 139688078 is about 518.8634917312.

The spelling of 139688078 in words is "one hundred thirty-nine million, six hundred eighty-eight thousand, seventy-eight".