139873441 has 4 divisors (see below), whose sum is σ = 140682132. Its totient is φ = 139064752.

The previous prime is 139873439. The next prime is 139873451. The reversal of 139873441 is 144378931.

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

It can be written as a sum of positive squares in 2 ways, for example, as 82174225 + 57699216 = 9065^2 + 7596^2 .

It is a cyclic number.

It is not a de Polignac number, because 139873441 - 2¹ = 139873439 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139873394 and 139873403.

It is not an unprimeable number, because it can be changed into a prime (139873411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404086 + ... + 404431.

It is an arithmetic number, because the mean of its divisors is an integer number (35170533).

Almost surely, 2^139873441 is an apocalyptic number.

It is an amenable number.

139873441 is a deficient number, since it is larger than the sum of its proper divisors (808691).

139873441 is an equidigital number, since it uses as much as digits as its factorization.

139873441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808690.

The product of its digits is 72576, while the sum is 40.

The square root of 139873441 is about 11826.8102631267. The cubic root of 139873441 is about 519.0928970941.

The spelling of 139873441 in words is "one hundred thirty-nine million, eight hundred seventy-three thousand, four hundred forty-one".