139127789 has 4 divisors (see below), whose sum is σ = 139657056. Its totient is φ = 138598524.

The previous prime is 139127777. The next prime is 139127797. The reversal of 139127789 is 987721931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 139127789 - 2⁴ = 139127773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139127089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264239 + ... + 264764.

It is an arithmetic number, because the mean of its divisors is an integer number (34914264).

Almost surely, 2^139127789 is an apocalyptic number.

It is an amenable number.

139127789 is a deficient number, since it is larger than the sum of its proper divisors (529267).

139127789 is an equidigital number, since it uses as much as digits as its factorization.

139127789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529266.

The product of its digits is 190512, while the sum is 47.

The square root of 139127789 is about 11795.2443382916. The cubic root of 139127789 is about 518.1688415182.

The spelling of 139127789 in words is "one hundred thirty-nine million, one hundred twenty-seven thousand, seven hundred eighty-nine".