1428665 has 8 divisors (see below), whose sum is σ = 1959360. Its totient is φ = 979632.

The previous prime is 1428649. The next prime is 1428671. The reversal of 1428665 is 5668241.

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 1428665 - 2⁴ = 1428649 is a prime.

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, 20375 + ... + 20444.

It is an arithmetic number, because the mean of its divisors is an integer number (244920).

2^1428665 is an apocalyptic number.

It is an amenable number.

1428665 is a deficient number, since it is larger than the sum of its proper divisors (530695).

1428665 is an equidigital number, since it uses as much as digits as its factorization.

1428665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40831.

The product of its digits is 11520, while the sum is 32.

The square root of 1428665 is about 1195.2677524304. The cubic root of 1428665 is about 112.6272469652.

The spelling of 1428665 in words is "one million, four hundred twenty-eight thousand, six hundred sixty-five".