139987127 has 4 divisors (see below), whose sum is σ = 159985296. Its totient is φ = 119988960.

The previous prime is 139987093. The next prime is 139987153. The reversal of 139987127 is 721789931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 721789931 = 419 ⋅1722649.

It is not a de Polignac number, because 139987127 - 2⁸ = 139986871 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 (139987157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9999074 + ... + 9999087.

It is an arithmetic number, because the mean of its divisors is an integer number (39996324).

Almost surely, 2^139987127 is an apocalyptic number.

139987127 is a deficient number, since it is larger than the sum of its proper divisors (19998169).

139987127 is an equidigital number, since it uses as much as digits as its factorization.

139987127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19998168.

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

The square root of 139987127 is about 11831.6155701578. The cubic root of 139987127 is about 519.2334947029.

The spelling of 139987127 in words is "one hundred thirty-nine million, nine hundred eighty-seven thousand, one hundred twenty-seven".