1440540 has 72 divisors (see below), whose sum is σ = 4481568. Its totient is φ = 374400.

The previous prime is 1440533. The next prime is 1440553. The reversal of 1440540 is 450441.

1440540 = T₁₀₉ + T₁₁₀ + ... + T₂₁₄.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9465 + ... + 9615.

It is an arithmetic number, because the mean of its divisors is an integer number (62244).

2^1440540 is an apocalyptic number.

1440540 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 1440540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2240784).

1440540 is an abundant number, since it is smaller than the sum of its proper divisors (3041028).

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

1440540 is a wasteful number, since it uses less digits than its factorization.

1440540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 1440540 is about 1200.2249789102. The cubic root of 1440540 is about 112.9384372421.

Adding to 1440540 its reverse (450441), we get a palindrome (1890981).

Subtracting from 1440540 its reverse (450441), we obtain a palindrome (990099).

The spelling of 1440540 in words is "one million, four hundred forty thousand, five hundred forty".