139864686440 has 32 divisors (see below), whose sum is σ = 316992604680. Its totient is φ = 55537508352.

The previous prime is 139864686419. The next prime is 139864686463. The reversal of 139864686440 is 44686468931.

It can be written as a sum of positive squares in 4 ways, for example, as 139751859556 + 112826884 = 373834^2 + 10622^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 139864686440.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12755897 + ... + 12766856.

Almost surely, 2^139864686440 is an apocalyptic number.

139864686440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139864686440 is an abundant number, since it is smaller than the sum of its proper divisors (177127918240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139864686440 is a wasteful number, since it uses less digits than its factorization.

139864686440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25522901 (or 25522897 counting only the distinct ones).

The product of its (nonzero) digits is 23887872, while the sum is 59.

The spelling of 139864686440 in words is "one hundred thirty-nine billion, eight hundred sixty-four million, six hundred eighty-six thousand, four hundred forty".