1042440 has 128 divisors (see below), whose sum is σ = 3836160. Its totient is φ = 221184.

The previous prime is 1042439. The next prime is 1042451. The reversal of 1042440 is 442401.

It is a Cunningham number, because it is equal to 1021²-1.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14244 + ... + 14316.

It is an arithmetic number, because the mean of its divisors is an integer number (29970).

2^1042440 is an apocalyptic number.

1042440 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 1042440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1918080).

1042440 is an abundant number, since it is smaller than the sum of its proper divisors (2793720).

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

1042440 is a wasteful number, since it uses less digits than its factorization.

1042440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 1042440 is about 1020.9995102839. Note that the first 3 decimals coincide. The cubic root of 1042440 is about 101.3951127585.

1042440 divided by its sum of digits (15) gives a palindrome (69496).

Adding to 1042440 its reverse (442401), we get a palindrome (1484841).

The spelling of 1042440 in words is "one million, forty-two thousand, four hundred forty".