139993728 has 64 divisors (see below), whose sum is σ = 424989120. Its totient is φ = 39997440.

The previous prime is 139993727. The next prime is 139993739. The reversal of 139993728 is 827399931.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139993727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23353 + ... + 28728.

It is an arithmetic number, because the mean of its divisors is an integer number (6640455).

Almost surely, 2^139993728 is an apocalyptic number.

It is an amenable number.

139993728 is an abundant number, since it is smaller than the sum of its proper divisors (284995392).

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

139993728 is an equidigital number, since it uses as much as digits as its factorization.

139993728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52105 (or 52093 counting only the distinct ones).

The product of its digits is 734832, while the sum is 51.

The square root of 139993728 is about 11831.8945228564. The cubic root of 139993728 is about 519.2416559448.

The spelling of 139993728 in words is "one hundred thirty-nine million, nine hundred ninety-three thousand, seven hundred twenty-eight".