1428687 has 12 divisors (see below), whose sum is σ = 2222584. Its totient is φ = 879120.

The previous prime is 1428677. The next prime is 1428689. The reversal of 1428687 is 7868241.

It is not a de Polignac number, because 1428687 - 2⁴ = 1428671 is a prime.

It is a super-2 number, since 2×1428687² = 4082293087938, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5989 + ... + 6222.

2^1428687 is an apocalyptic number.

1428687 is a deficient number, since it is larger than the sum of its proper divisors (793897).

1428687 is a wasteful number, since it uses less digits than its factorization.

1428687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12230 (or 12227 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 1428687 is about 1195.2769553539. The cubic root of 1428687 is about 112.6278250776.

The spelling of 1428687 in words is "one million, four hundred twenty-eight thousand, six hundred eighty-seven".