1144240 has 20 divisors (see below), whose sum is σ = 2660544. Its totient is φ = 457664.

The previous prime is 1144223. The next prime is 1144243. The reversal of 1144240 is 424411.

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

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (1144243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7072 + ... + 7231.

2^1144240 is an apocalyptic number.

1144240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1144240 is an abundant number, since it is smaller than the sum of its proper divisors (1516304).

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

1144240 is a wasteful number, since it uses less digits than its factorization.

1144240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14316 (or 14310 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1144240 is about 1069.6915443248. The cubic root of 1144240 is about 104.5937438601.

Adding to 1144240 its reverse (424411), we get a palindrome (1568651).

The spelling of 1144240 in words is "one million, one hundred forty-four thousand, two hundred forty".