1389791 has 4 divisors (see below), whose sum is σ = 1496712. Its totient is φ = 1282872.

The previous prime is 1389769. The next prime is 1389797. The reversal of 1389791 is 1979831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1979831 = 7 ⋅282833.

It is a cyclic number.

It is not a de Polignac number, because 1389791 - 2⁶ = 1389727 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 (1389797) 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, 53441 + ... + 53466.

It is an arithmetic number, because the mean of its divisors is an integer number (374178).

2^1389791 is an apocalyptic number.

1389791 is a deficient number, since it is larger than the sum of its proper divisors (106921).

1389791 is a wasteful number, since it uses less digits than its factorization.

1389791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106920.

The product of its digits is 13608, while the sum is 38.

The square root of 1389791 is about 1178.8939731799. The cubic root of 1389791 is about 111.5963092351.

The spelling of 1389791 in words is "one million, three hundred eighty-nine thousand, seven hundred ninety-one".