1143440 has 20 divisors (see below), whose sum is σ = 2658684. Its totient is φ = 457344.

The previous prime is 1143433. The next prime is 1143469. The reversal of 1143440 is 443411.

It can be written as a sum of positive squares in 2 ways, for example, as 135424 + 1008016 = 368^2 + 1004^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7067 + ... + 7226.

2^1143440 is an apocalyptic number.

1143440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1143440 is an abundant number, since it is smaller than the sum of its proper divisors (1515244).

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

1143440 is a wasteful number, since it uses less digits than its factorization.

1143440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14306 (or 14300 counting only the distinct ones).

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

The square root of 1143440 is about 1069.3175393680. The cubic root of 1143440 is about 104.5693624648.

Adding to 1143440 its reverse (443411), we get a palindrome (1586851).

The spelling of 1143440 in words is "one million, one hundred forty-three thousand, four hundred forty".