1428905 has 4 divisors (see below), whose sum is σ = 1714692. Its totient is φ = 1143120.

The previous prime is 1428899. The next prime is 1428923. The reversal of 1428905 is 5098241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1087849 + 341056 = 1043^2 + 584^2 .

It is not a de Polignac number, because 1428905 - 2⁸ = 1428649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142886 + ... + 142895.

It is an arithmetic number, because the mean of its divisors is an integer number (428673).

2^1428905 is an apocalyptic number.

It is an amenable number.

1428905 is a deficient number, since it is larger than the sum of its proper divisors (285787).

1428905 is an equidigital number, since it uses as much as digits as its factorization.

1428905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285786.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 1428905 is about 1195.3681441297. The cubic root of 1428905 is about 112.6335533248.

The spelling of 1428905 in words is "one million, four hundred twenty-eight thousand, nine hundred five".