1428989 has 4 divisors (see below), whose sum is σ = 1435356. Its totient is φ = 1422624.

The previous prime is 1428979. The next prime is 1428991. The reversal of 1428989 is 9898241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 917764 + 511225 = 958^2 + 715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1428989 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 (1428929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2834 + ... + 3299.

It is an arithmetic number, because the mean of its divisors is an integer number (358839).

2^1428989 is an apocalyptic number.

It is an amenable number.

1428989 is a deficient number, since it is larger than the sum of its proper divisors (6367).

1428989 is an equidigital number, since it uses as much as digits as its factorization.

1428989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6366.

The product of its digits is 41472, while the sum is 41.

The square root of 1428989 is about 1195.4032792326. The cubic root of 1428989 is about 112.6357603839.

It can be divided in two parts, 14289 and 89, that multiplied together give a palindrome (1271721).

The spelling of 1428989 in words is "one million, four hundred twenty-eight thousand, nine hundred eighty-nine".