1028440 has 32 divisors (see below), whose sum is σ = 2645280. Its totient is φ = 352512.

The previous prime is 1028437. The next prime is 1028471. The reversal of 1028440 is 448201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1557 + ... + 2116.

It is an arithmetic number, because the mean of its divisors is an integer number (82665).

2^1028440 is an apocalyptic number.

1028440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1028440 is an abundant number, since it is smaller than the sum of its proper divisors (1616840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1028440 is a wasteful number, since it uses less digits than its factorization.

1028440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3691 (or 3687 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1028440 is about 1014.1203084447. The cubic root of 1028440 is about 100.9391523179.

The spelling of 1028440 in words is "one million, twenty-eight thousand, four hundred forty".