139955709 has 16 divisors (see below), whose sum is σ = 188521344. Its totient is φ = 92352000.

The previous prime is 139955681. The next prime is 139955723. The reversal of 139955709 is 907559931.

It is not a de Polignac number, because 139955709 - 2⁷ = 139955581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139955749) 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 15 ways as a sum of consecutive naturals, for example, 235717 + ... + 236309.

It is an arithmetic number, because the mean of its divisors is an integer number (11782584).

Almost surely, 2^139955709 is an apocalyptic number.

It is an amenable number.

139955709 is a deficient number, since it is larger than the sum of its proper divisors (48565635).

139955709 is a wasteful number, since it uses less digits than its factorization.

139955709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268.

The product of its (nonzero) digits is 382725, while the sum is 48.

The square root of 139955709 is about 11830.2877817913. The cubic root of 139955709 is about 519.1946470868.

The spelling of 139955709 in words is "one hundred thirty-nine million, nine hundred fifty-five thousand, seven hundred nine".