139520393938 has 8 divisors (see below), whose sum is σ = 209284120188. Its totient is φ = 69759020544.

The previous prime is 139520393923. The next prime is 139520393963. The reversal of 139520393938 is 839393025931.

It can be written as a sum of positive squares in 2 ways, for example, as 114634384929 + 24886009009 = 338577^2 + 157753^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×139520393938² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431631 + ... + 682162.

Almost surely, 2^139520393938 is an apocalyptic number.

139520393938 is a deficient number, since it is larger than the sum of its proper divisors (69763726250).

139520393938 is a wasteful number, since it uses less digits than its factorization.

139520393938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176428.

The product of its (nonzero) digits is 4723920, while the sum is 55.

The spelling of 139520393938 in words is "one hundred thirty-nine billion, five hundred twenty million, three hundred ninety-three thousand, nine hundred thirty-eight".