1428587989 has 2 divisors, whose sum is σ = 1428587990. Its totient is φ = 1428587988.

The previous prime is 1428587987. The next prime is 1428588037. The reversal of 1428587989 is 9897858241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 824264100 + 604323889 = 28710^2 + 24583^2 .

It is an emirp because it is prime and its reverse (9897858241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1428587989 - 2¹ = 1428587987 is a prime.

Together with 1428587987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1428587987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 714293994 + 714293995.

It is an arithmetic number, because the mean of its divisors is an integer number (714293995).

Almost surely, 2^1428587989 is an apocalyptic number.

It is an amenable number.

1428587989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1428587989 is an equidigital number, since it uses as much as digits as its factorization.

1428587989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11612160, while the sum is 61.

The square root of 1428587989 is about 37796.6663741659. Note that the first 3 decimals coincide. The cubic root of 1428587989 is about 1126.2522323612.

The spelling of 1428587989 in words is "one billion, four hundred twenty-eight million, five hundred eighty-seven thousand, nine hundred eighty-nine".