1389731671 has 4 divisors (see below), whose sum is σ = 1398935344. Its totient is φ = 1380528000.

The previous prime is 1389731659. The next prime is 1389731677. The reversal of 1389731671 is 1761379831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1761379831 = 283 ⋅6223957.

It is a cyclic number.

It is not a de Polignac number, because 1389731671 - 2⁵ = 1389731639 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 (1389731677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4601610 + ... + 4601911.

It is an arithmetic number, because the mean of its divisors is an integer number (349733836).

Almost surely, 2^1389731671 is an apocalyptic number.

1389731671 is a deficient number, since it is larger than the sum of its proper divisors (9203673).

1389731671 is an equidigital number, since it uses as much as digits as its factorization.

1389731671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9203672.

The product of its digits is 190512, while the sum is 46.

The square root of 1389731671 is about 37279.1050187635. The cubic root of 1389731671 is about 1115.9472122850.

The spelling of 1389731671 in words is "one billion, three hundred eighty-nine million, seven hundred thirty-one thousand, six hundred seventy-one".