139261819684 has 81 divisors (see below), whose sum is σ = 273274665489. Its totient is φ = 62066964960.

The previous prime is 139261819679. The next prime is 139261819687. The reversal of 139261819684 is 486918162931.

The square root of 139261819684 is 373178.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 20600860900 + 118660958784 = 143530^2 + 344472^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139261819687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 300781237 + ... + 300781699.

Almost surely, 2^139261819684 is an apocalyptic number.

139261819684 is the 373178-th square number.

It is an amenable number.

139261819684 is a deficient number, since it is larger than the sum of its proper divisors (134012845805).

139261819684 is an equidigital number, since it uses as much as digits as its factorization.

139261819684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018 (or 509 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 58.

The spelling of 139261819684 in words is "one hundred thirty-nine billion, two hundred sixty-one million, eight hundred nineteen thousand, six hundred eighty-four".