139438441 has 4 divisors (see below), whose sum is σ = 140741712. Its totient is φ = 138135172.

The previous prime is 139438433. The next prime is 139438483. The reversal of 139438441 is 144834931.

139438441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 144834931 = 683 ⋅212057.

It is a cyclic number.

It is not a de Polignac number, because 139438441 - 2³ = 139438433 is a prime.

It is a super-3 number, since 3×139438441³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139438441.

It is not an unprimeable number, because it can be changed into a prime (139438241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 651475 + ... + 651688.

It is an arithmetic number, because the mean of its divisors is an integer number (35185428).

Almost surely, 2^139438441 is an apocalyptic number.

It is an amenable number.

139438441 is a deficient number, since it is larger than the sum of its proper divisors (1303271).

139438441 is a wasteful number, since it uses less digits than its factorization.

139438441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1303270.

The product of its digits is 41472, while the sum is 37.

The square root of 139438441 is about 11808.4055231856. The cubic root of 139438441 is about 518.5542199028.

The spelling of 139438441 in words is "one hundred thirty-nine million, four hundred thirty-eight thousand, four hundred forty-one".