1440640 has 32 divisors (see below), whose sum is σ = 3445560. Its totient is φ = 576000.

The previous prime is 1440623. The next prime is 1440641. The reversal of 1440640 is 460441.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440641) 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 3 ways as a sum of consecutive naturals, for example, 486 + ... + 1765.

2^1440640 is an apocalyptic number.

1440640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1440640 is an abundant number, since it is smaller than the sum of its proper divisors (2004920).

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

1440640 is an equidigital number, since it uses as much as digits as its factorization.

1440640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2270 (or 2258 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1440640 is about 1200.2666370436. The cubic root of 1440640 is about 112.9410505173.

It can be divided in two parts, 1440 and 640, that multiplied together give a square (921600 = 960²).

The spelling of 1440640 in words is "one million, four hundred forty thousand, six hundred forty".