139447 has 8 divisors (see below), whose sum is σ = 173952. Its totient is φ = 108600.

The previous prime is 139439. The next prime is 139457. The reversal of 139447 is 744931.

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 139447 - 2³ = 139439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139457) 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, 829 + ... + 982.

It is an arithmetic number, because the mean of its divisors is an integer number (21744).

2¹³⁹⁴⁴⁷ is an apocalyptic number.

139447 is a deficient number, since it is larger than the sum of its proper divisors (34505).

139447 is a wasteful number, since it uses less digits than its factorization.

139447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829.

The product of its digits is 3024, while the sum is 28.

The square root of 139447 is about 373.4260301586. The cubic root of 139447 is about 51.8564829638.

It can be divided in two parts, 1394 and 47, that added together give a palindrome (1441).

The spelling of 139447 in words is "one hundred thirty-nine thousand, four hundred forty-seven".