1428809905 has 8 divisors (see below), whose sum is σ = 1719245952. Its totient is φ = 1139931888.

The previous prime is 1428809873. The next prime is 1428809911. The reversal of 1428809905 is 5099088241.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1428809905 - 2⁵ = 1428809873 is a prime.

It is a super-2 number, since 2×1428809905² = 4082995489252218050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 387487 + ... + 391156.

It is an arithmetic number, because the mean of its divisors is an integer number (214905744).

Almost surely, 2^1428809905 is an apocalyptic number.

It is an amenable number.

1428809905 is a deficient number, since it is larger than the sum of its proper divisors (290436047).

1428809905 is an equidigital number, since it uses as much as digits as its factorization.

1428809905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779015.

The product of its (nonzero) digits is 207360, while the sum is 46.

The square root of 1428809905 is about 37799.6019158932. The cubic root of 1428809905 is about 1126.3105464569.

The spelling of 1428809905 in words is "one billion, four hundred twenty-eight million, eight hundred nine thousand, nine hundred five".