1428505 has 8 divisors (see below), whose sum is σ = 1846152. Its totient is φ = 1054848.

The previous prime is 1428491. The next prime is 1428521. The reversal of 1428505 is 5058241.

It can be written as a sum of positive squares in 4 ways, for example, as 17161 + 1411344 = 131^2 + 1188^2 .

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 1428505 - 2⁵ = 1428473 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1428505.

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, 10924 + ... + 11053.

It is an arithmetic number, because the mean of its divisors is an integer number (230769).

2^1428505 is an apocalyptic number.

It is an amenable number.

1428505 is a deficient number, since it is larger than the sum of its proper divisors (417647).

1428505 is a wasteful number, since it uses less digits than its factorization.

1428505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21995.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 1428505 is about 1195.2008199462. The cubic root of 1428505 is about 112.6230423331.

The spelling of 1428505 in words is "one million, four hundred twenty-eight thousand, five hundred five".