139444439 has 8 divisors (see below), whose sum is σ = 147123840. Its totient is φ = 131799096.

The previous prime is 139444429. The next prime is 139444471. The reversal of 139444439 is 934444931.

139444439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 139444439 - 2²⁰ = 138395863 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 139444396 and 139444405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139444429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134 + ... + 16700.

It is an arithmetic number, because the mean of its divisors is an integer number (18390480).

Almost surely, 2^139444439 is an apocalyptic number.

139444439 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

139444439 is a deficient number, since it is larger than the sum of its proper divisors (7679401).

139444439 is a wasteful number, since it uses less digits than its factorization.

139444439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17029.

The product of its digits is 186624, while the sum is 41.

The square root of 139444439 is about 11808.6594920846. The cubic root of 139444439 is about 518.5616550682.

The spelling of 139444439 in words is "one hundred thirty-nine million, four hundred forty-four thousand, four hundred thirty-nine".