1428389 has 2 divisors, whose sum is σ = 1428390. Its totient is φ = 1428388.

The previous prime is 1428359. The next prime is 1428409. The reversal of 1428389 is 9838241.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1399489 + 28900 = 1183^2 + 170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1428389 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1428359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 714194 + 714195.

It is an arithmetic number, because the mean of its divisors is an integer number (714195).

2^1428389 is an apocalyptic number.

It is an amenable number.

1428389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1428389 is an equidigital number, since it uses as much as digits as its factorization.

1428389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 35.

The square root of 1428389 is about 1195.1522915512. The cubic root of 1428389 is about 112.6199937785.

The spelling of 1428389 in words is "one million, four hundred twenty-eight thousand, three hundred eighty-nine".