1043840 has 64 divisors (see below), whose sum is σ = 2864160. Its totient is φ = 356352.

The previous prime is 1043839. The next prime is 1043843. The reversal of 1043840 is 483401.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1043843) by changing a digit.

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, 4364 + ... + 4596.

2^1043840 is an apocalyptic number.

1043840 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 1043840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1432080).

1043840 is an abundant number, since it is smaller than the sum of its proper divisors (1820320).

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

1043840 is an equidigital number, since it uses as much as digits as its factorization.

1043840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259 (or 247 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1043840 is about 1021.6848829262. The cubic root of 1043840 is about 101.4404837654.

The spelling of 1043840 in words is "one million, forty-three thousand, eight hundred forty".