139488421738 has 4 divisors (see below), whose sum is σ = 209232632610. Its totient is φ = 69744210868.

The previous prime is 139488421727. The next prime is 139488421753. The reversal of 139488421738 is 837124884931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 138393672169 + 1094749569 = 372013^2 + 33087^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34872105433 + ... + 34872105436.

Almost surely, 2^139488421738 is an apocalyptic number.

139488421738 is a deficient number, since it is larger than the sum of its proper divisors (69744210872).

139488421738 is an equidigital number, since it uses as much as digits as its factorization.

139488421738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69744210871.

The product of its digits is 9289728, while the sum is 58.

The spelling of 139488421738 in words is "one hundred thirty-nine billion, four hundred eighty-eight million, four hundred twenty-one thousand, seven hundred thirty-eight".