139938436 has 18 divisors (see below), whose sum is σ = 269180030. Its totient is φ = 63608160.

The previous prime is 139938431. The next prime is 139938443. The reversal of 139938436 is 634839931.

It can be written as a sum of positive squares in only one way, i.e., 109202500 + 30735936 = 10450^2 + 5544^2 .

It is not an unprimeable number, because it can be changed into a prime (139938431) 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 5 ways as a sum of consecutive naturals, for example, 144081 + ... + 145048.

Almost surely, 2^139938436 is an apocalyptic number.

It is an amenable number.

139938436 is a deficient number, since it is larger than the sum of its proper divisors (129241594).

139938436 is a wasteful number, since it uses less digits than its factorization.

139938436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289155 (or 289142 counting only the distinct ones).

The product of its digits is 419904, while the sum is 46.

The square root of 139938436 is about 11829.5577263057. The cubic root of 139938436 is about 519.1732869527.

The spelling of 139938436 in words is "one hundred thirty-nine million, nine hundred thirty-eight thousand, four hundred thirty-six".