139720771 has 4 divisors (see below), whose sum is σ = 140957352. Its totient is φ = 138484192.

The previous prime is 139720747. The next prime is 139720781. The reversal of 139720771 is 177027931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 177027931 = 12517 ⋅14143.

It is a cyclic number.

It is not a de Polignac number, because 139720771 - 2¹⁷ = 139589699 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139720771.

It is not an unprimeable number, because it can be changed into a prime (139720741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 618121 + ... + 618346.

It is an arithmetic number, because the mean of its divisors is an integer number (35239338).

Almost surely, 2^139720771 is an apocalyptic number.

139720771 is a deficient number, since it is larger than the sum of its proper divisors (1236581).

139720771 is a wasteful number, since it uses less digits than its factorization.

139720771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236580.

The product of its (nonzero) digits is 18522, while the sum is 37.

The square root of 139720771 is about 11820.3540979109. The cubic root of 139720771 is about 518.9039673422.

The spelling of 139720771 in words is "one hundred thirty-nine million, seven hundred twenty thousand, seven hundred seventy-one".