1389771 has 8 divisors (see below), whose sum is σ = 2058960. Its totient is φ = 926496.

The previous prime is 1389769. The next prime is 1389797. The reversal of 1389771 is 1779831.

It is not a de Polignac number, because 1389771 - 2¹ = 1389769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1389371) 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 7 ways as a sum of consecutive naturals, for example, 25710 + ... + 25763.

It is an arithmetic number, because the mean of its divisors is an integer number (257370).

2^1389771 is an apocalyptic number.

1389771 is a deficient number, since it is larger than the sum of its proper divisors (669189).

1389771 is an equidigital number, since it uses as much as digits as its factorization.

1389771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51482 (or 51476 counting only the distinct ones).

The product of its digits is 10584, while the sum is 36.

The square root of 1389771 is about 1178.8854906224. The cubic root of 1389771 is about 111.5957739179.

The spelling of 1389771 in words is "one million, three hundred eighty-nine thousand, seven hundred seventy-one".