139499668 has 72 divisors (see below), whose sum is σ = 313709760. Its totient is φ = 53665920.

The previous prime is 139499651. The next prime is 139499683. The reversal of 139499668 is 866994931.

It is a super-2 number, since 2×139499668² = 38920314744220448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 191521 + ... + 192247.

It is an arithmetic number, because the mean of its divisors is an integer number (4357080).

Almost surely, 2^139499668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139499668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156854880).

139499668 is an abundant number, since it is smaller than the sum of its proper divisors (174210092).

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

139499668 is a wasteful number, since it uses less digits than its factorization.

139499668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845 (or 836 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 55.

The square root of 139499668 is about 11810.9977563286. The cubic root of 139499668 is about 518.6301073293.

The spelling of 139499668 in words is "one hundred thirty-nine million, four hundred ninety-nine thousand, six hundred sixty-eight".