1428287 has 8 divisors (see below), whose sum is σ = 1718400. Its totient is φ = 1159704.

The previous prime is 1428281. The next prime is 1428359. The reversal of 1428287 is 7828241.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1428287 - 2¹² = 1424191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5237 + ... + 5502.

It is an arithmetic number, because the mean of its divisors is an integer number (214800).

2^1428287 is an apocalyptic number.

1428287 is a deficient number, since it is larger than the sum of its proper divisors (290113).

1428287 is a wasteful number, since it uses less digits than its factorization.

1428287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10765.

The product of its digits is 7168, while the sum is 32.

The square root of 1428287 is about 1195.1096184033. The cubic root of 1428287 is about 112.6173130165.

The spelling of 1428287 in words is "one million, four hundred twenty-eight thousand, two hundred eighty-seven".