1142240 has 72 divisors (see below), whose sum is σ = 3016440. Its totient is φ = 408320.

The previous prime is 1142237. The next prime is 1142243. The reversal of 1142240 is 422411.

It is an interprime number because it is at equal distance from previous prime (1142237) and next prime (1142243).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1142243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19331 + ... + 19389.

It is an arithmetic number, because the mean of its divisors is an integer number (41895).

2^1142240 is an apocalyptic number.

1142240 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 1142240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1508220).

1142240 is an abundant number, since it is smaller than the sum of its proper divisors (1874200).

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

1142240 is a wasteful number, since it uses less digits than its factorization.

1142240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1142240 is about 1068.7562865312. The cubic root of 1142240 is about 104.5327690399.

Adding to 1142240 its reverse (422411), we get a palindrome (1564651).

It can be divided in two parts, 1 and 142240, that added together give a palindrome (142241).

The spelling of 1142240 in words is "one million, one hundred forty-two thousand, two hundred forty".