139756668 has 12 divisors (see below), whose sum is σ = 326098920. Its totient is φ = 46585552.

The previous prime is 139756667. The next prime is 139756697. The reversal of 139756668 is 866657931.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 139756668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139756667) 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 3 ways as a sum of consecutive naturals, for example, 5823183 + ... + 5823206.

It is an arithmetic number, because the mean of its divisors is an integer number (27174910).

Almost surely, 2^139756668 is an apocalyptic number.

It is an amenable number.

139756668 is an abundant number, since it is smaller than the sum of its proper divisors (186342252).

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

139756668 is a wasteful number, since it uses less digits than its factorization.

139756668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11646396 (or 11646394 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 51.

The square root of 139756668 is about 11821.8724405231. The cubic root of 139756668 is about 518.9484023979.

The spelling of 139756668 in words is "one hundred thirty-nine million, seven hundred fifty-six thousand, six hundred sixty-eight".