1428889 has 18 divisors (see below), whose sum is σ = 1834602. Its totient is φ = 1108800.

The previous prime is 1428887. The next prime is 1428893. The reversal of 1428889 is 9888241.

It can be written as a sum of positive squares in only one way, i.e., 1334025 + 94864 = 1155^2 + 308^2 .

It is not a de Polignac number, because 1428889 - 2¹ = 1428887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1428887) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5809 + ... + 6049.

2^1428889 is an apocalyptic number.

It is an amenable number.

1428889 is a deficient number, since it is larger than the sum of its proper divisors (405713).

1428889 is a wasteful number, since it uses less digits than its factorization.

1428889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277 (or 259 counting only the distinct ones).

The product of its digits is 36864, while the sum is 40.

The square root of 1428889 is about 1195.3614516120. The cubic root of 1428889 is about 112.6331329228.

The spelling of 1428889 in words is "one million, four hundred twenty-eight thousand, eight hundred eighty-nine".