1428889447 has 2 divisors, whose sum is σ = 1428889448. Its totient is φ = 1428889446.

The previous prime is 1428889403. The next prime is 1428889489. The reversal of 1428889447 is 7449888241.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1428889447 - 2¹¹ = 1428887399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1428889747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 714444723 + 714444724.

It is an arithmetic number, because the mean of its divisors is an integer number (714444724).

Almost surely, 2^1428889447 is an apocalyptic number.

1428889447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1428889447 is an equidigital number, since it uses as much as digits as its factorization.

1428889447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4128768, while the sum is 55.

The square root of 1428889447 is about 37800.6540551880. The cubic root of 1428889447 is about 1126.3314466785.

The spelling of 1428889447 in words is "one billion, four hundred twenty-eight million, eight hundred eighty-nine thousand, four hundred forty-seven".