1428989805 has 24 divisors (see below), whose sum is σ = 2479789728. Its totient is φ = 761243616.

The previous prime is 1428989801. The next prime is 1428989827. The reversal of 1428989805 is 5089898241.

It is not a de Polignac number, because 1428989805 - 2² = 1428989801 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428989801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21754 + ... + 57716.

It is an arithmetic number, because the mean of its divisors is an integer number (103324572).

Almost surely, 2^1428989805 is an apocalyptic number.

1428989805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1428989805 is a deficient number, since it is larger than the sum of its proper divisors (1050799923).

1428989805 is a wasteful number, since it uses less digits than its factorization.

1428989805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36857 (or 36854 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 54.

The square root of 1428989805 is about 37801.9814956835. The cubic root of 1428989805 is about 1126.3578153444.

The spelling of 1428989805 in words is "one billion, four hundred twenty-eight million, nine hundred eighty-nine thousand, eight hundred five".