1440840 has 32 divisors (see below), whose sum is σ = 4322880. Its totient is φ = 384192.

The previous prime is 1440823. The next prime is 1440847. The reversal of 1440840 is 480441.

It is not an unprimeable number, because it can be changed into a prime (1440847) 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, 5884 + ... + 6123.

It is an arithmetic number, because the mean of its divisors is an integer number (135090).

2^1440840 is an apocalyptic number.

1440840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1440840 is an abundant number, since it is smaller than the sum of its proper divisors (2882040).

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

1440840 is a wasteful number, since it uses less digits than its factorization.

1440840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12021 (or 12017 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 1440840 is about 1200.3499489732. The cubic root of 1440840 is about 112.9462767049.

The spelling of 1440840 in words is "one million, four hundred forty thousand, eight hundred forty".