1389811 has 2 divisors, whose sum is σ = 1389812. Its totient is φ = 1389810.

The previous prime is 1389809. The next prime is 1389833. The reversal of 1389811 is 1189831.

It is a weak prime.

It is an emirp because it is prime and its reverse (1189831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1389811 - 2¹ = 1389809 is a prime.

Together with 1389809, it forms a pair of twin primes.

1389811 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1389841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694905 + 694906.

It is an arithmetic number, because the mean of its divisors is an integer number (694906).

2^1389811 is an apocalyptic number.

1389811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389811 is an equidigital number, since it uses as much as digits as its factorization.

1389811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 31.

The square root of 1389811 is about 1178.9024556765. The cubic root of 1389811 is about 111.5968445471.

The spelling of 1389811 in words is "one million, three hundred eighty-nine thousand, eight hundred eleven".