1431440 has 40 divisors (see below), whose sum is σ = 3448440. Its totient is φ = 551936.

The previous prime is 1431439. The next prime is 1431449. The reversal of 1431440 is 441341.

It can be written as a sum of positive squares in 4 ways, for example, as 1024 + 1430416 = 32^2 + 1196^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1431449) 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, 2012 + ... + 2628.

It is an arithmetic number, because the mean of its divisors is an integer number (86211).

2^1431440 is an apocalyptic number.

1431440 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 1431440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1724220).

1431440 is an abundant number, since it is smaller than the sum of its proper divisors (2017000).

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

1431440 is a wasteful number, since it uses less digits than its factorization.

1431440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659 (or 653 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1431440 is about 1196.4280170574. The cubic root of 1431440 is about 112.7001211687.

Adding to 1431440 its reverse (441341), we get a palindrome (1872781).

Subtracting from 1431440 its reverse (441341), we obtain a palindrome (990099).

The spelling of 1431440 in words is "one million, four hundred thirty-one thousand, four hundred forty".