1667389 has 2 divisors, whose sum is σ = 1667390. Its totient is φ = 1667388.

The previous prime is 1667363. The next prime is 1667401. The reversal of 1667389 is 9837661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 931225 + 736164 = 965^2 + 858^2 .

It is a cyclic number.

It is not a de Polignac number, because 1667389 - 2⁵ = 1667357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1667329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833694 + 833695.

It is an arithmetic number, because the mean of its divisors is an integer number (833695).

2^1667389 is an apocalyptic number.

It is an amenable number.

1667389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1667389 is an equidigital number, since it uses as much as digits as its factorization.

1667389 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 1667389 is about 1291.2741769276. The cubic root of 1667389 is about 118.5802360931.

The spelling of 1667389 in words is "one million, six hundred sixty-seven thousand, three hundred eighty-nine".