1000440 has 96 divisors (see below), whose sum is σ = 3725280. Its totient is φ = 228096.

The previous prime is 1000429. The next prime is 1000453. The reversal of 1000440 is 440001.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2322 + ... + 2718.

It is an arithmetic number, because the mean of its divisors is an integer number (38805).

2^1000440 is an apocalyptic number.

1000440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1000440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1862640).

1000440 is an abundant number, since it is smaller than the sum of its proper divisors (2724840).

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

1000440 is a wasteful number, since it uses less digits than its factorization.

1000440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 414 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 1000440 is about 1000.2199758053. The cubic root of 1000440 is about 100.0146645161.

Adding to 1000440 its reverse (440001), we get a palindrome (1440441).

The spelling of 1000440 in words is "one million, four hundred forty", and thus it is an aban number.