139444613 has 8 divisors (see below), whose sum is σ = 173853120. Its totient is φ = 108658080.

The previous prime is 139444589. The next prime is 139444631. The reversal of 139444613 is 316444931.

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 139444613 - 2⁶ = 139444549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139494613) 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, 905408 + ... + 905561.

It is an arithmetic number, because the mean of its divisors is an integer number (21731640).

Almost surely, 2^139444613 is an apocalyptic number.

It is an amenable number.

139444613 is a deficient number, since it is larger than the sum of its proper divisors (34408507).

139444613 is a wasteful number, since it uses less digits than its factorization.

139444613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1810987.

The product of its digits is 31104, while the sum is 35.

The square root of 139444613 is about 11808.6668595570. Note that the first 3 decimals coincide. The cubic root of 139444613 is about 518.5618707567.

The spelling of 139444613 in words is "one hundred thirty-nine million, four hundred forty-four thousand, six hundred thirteen".