1428669 has 12 divisors (see below), whose sum is σ = 2251392. Its totient is φ = 865800.

The previous prime is 1428649. The next prime is 1428671. The reversal of 1428669 is 9668241.

It is not a de Polignac number, because 1428669 - 2⁷ = 1428541 is a prime.

It is a super-2 number, since 2×1428669² = 4082190223122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428649) 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, 7117 + ... + 7314.

It is an arithmetic number, because the mean of its divisors is an integer number (187616).

2^1428669 is an apocalyptic number.

It is an amenable number.

1428669 is a deficient number, since it is larger than the sum of its proper divisors (822723).

1428669 is a wasteful number, since it uses less digits than its factorization.

1428669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14448 (or 14445 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 1428669 is about 1195.2694256945. The cubic root of 1428669 is about 112.6273520770.

The spelling of 1428669 in words is "one million, four hundred twenty-eight thousand, six hundred sixty-nine".