1389667 has 2 divisors, whose sum is σ = 1389668. Its totient is φ = 1389666.

The previous prime is 1389643. The next prime is 1389673. The reversal of 1389667 is 7669831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1389667 - 2⁷ = 1389539 is a prime.

It is not a weakly prime, because it can be changed into another prime (1389677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694833 + 694834.

It is an arithmetic number, because the mean of its divisors is an integer number (694834).

2^1389667 is an apocalyptic number.

1389667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389667 is an equidigital number, since it uses as much as digits as its factorization.

1389667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The square root of 1389667 is about 1178.8413803392. The cubic root of 1389667 is about 111.5929901859.

The spelling of 1389667 in words is "one million, three hundred eighty-nine thousand, six hundred sixty-seven".