139578449 has 4 divisors (see below), whose sum is σ = 147788964. Its totient is φ = 131367936.

The previous prime is 139578443. The next prime is 139578457. The reversal of 139578449 is 944875931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 944875931 = 22691 ⋅41641.

It can be written as a sum of positive squares in 2 ways, for example, as 100140049 + 39438400 = 10007^2 + 6280^2 .

It is a cyclic number.

It is not a de Polignac number, because 139578449 - 2⁸ = 139578193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139578397 and 139578406.

It is not an unprimeable number, because it can be changed into a prime (139578443) 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, 4105232 + ... + 4105265.

It is an arithmetic number, because the mean of its divisors is an integer number (36947241).

Almost surely, 2^139578449 is an apocalyptic number.

It is an amenable number.

139578449 is a deficient number, since it is larger than the sum of its proper divisors (8210515).

139578449 is an equidigital number, since it uses as much as digits as its factorization.

139578449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8210514.

The product of its digits is 1088640, while the sum is 50.

The square root of 139578449 is about 11814.3323552370. The cubic root of 139578449 is about 518.7277192927.

The spelling of 139578449 in words is "one hundred thirty-nine million, five hundred seventy-eight thousand, four hundred forty-nine".