1428215 has 4 divisors (see below), whose sum is σ = 1713864. Its totient is φ = 1142568.

The previous prime is 1428209. The next prime is 1428233. The reversal of 1428215 is 5128241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5128241 = 23 ⋅222967.

It is a cyclic number.

It is not a de Polignac number, because 1428215 - 2⁴ = 1428199 is a prime.

It is a Duffinian number.

It is a congruent 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, 142817 + ... + 142826.

It is an arithmetic number, because the mean of its divisors is an integer number (428466).

2^1428215 is an apocalyptic number.

1428215 is a deficient number, since it is larger than the sum of its proper divisors (285649).

1428215 is an equidigital number, since it uses as much as digits as its factorization.

1428215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285648.

The product of its digits is 640, while the sum is 23.

The square root of 1428215 is about 1195.0794952638. The cubic root of 1428215 is about 112.6154206371.

The spelling of 1428215 in words is "one million, four hundred twenty-eight thousand, two hundred fifteen".