139039744 has 22 divisors (see below), whose sum is σ = 277945754. Its totient is φ = 69519360.

The previous prime is 139039729. The next prime is 139039751. The reversal of 139039744 is 447930931.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 72454144 + 66585600 = 8512^2 + 8160^2 .

It is a junction number, because it is equal to n+sod(n) for n = 139039697 and 139039706.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66867 + ... + 68914.

Almost surely, 2^139039744 is an apocalyptic number.

It is an amenable number.

139039744 is a deficient number, since it is larger than the sum of its proper divisors (138906010).

139039744 is an equidigital number, since it uses as much as digits as its factorization.

139039744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135801 (or 135783 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 139039744 is about 11791.5115231254. The cubic root of 139039744 is about 518.0595132449.

The spelling of 139039744 in words is "one hundred thirty-nine million, thirty-nine thousand, seven hundred forty-four".