1428865 has 4 divisors (see below), whose sum is σ = 1714644. Its totient is φ = 1143088.

The previous prime is 1428863. The next prime is 1428887. The reversal of 1428865 is 5688241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5688241 = 13 ⋅437557.

It can be written as a sum of positive squares in 2 ways, for example, as 190096 + 1238769 = 436^2 + 1113^2 .

It is a cyclic number.

It is not a de Polignac number, because 1428865 - 2¹ = 1428863 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 1428865.

It is not an unprimeable number, because it can be changed into a prime (1428863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142882 + ... + 142891.

It is an arithmetic number, because the mean of its divisors is an integer number (428661).

2^1428865 is an apocalyptic number.

It is an amenable number.

1428865 is a deficient number, since it is larger than the sum of its proper divisors (285779).

1428865 is an equidigital number, since it uses as much as digits as its factorization.

1428865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285778.

The product of its digits is 15360, while the sum is 34.

The square root of 1428865 is about 1195.3514127653. The cubic root of 1428865 is about 112.6325023139.

The spelling of 1428865 in words is "one million, four hundred twenty-eight thousand, eight hundred sixty-five".