1143212240 has 80 divisors (see below), whose sum is σ = 2784786048. Its totient is φ = 435629568.

The previous prime is 1143212237. The next prime is 1143212249. The reversal of 1143212240 is 422123411.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143212249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 508559 + ... + 510801.

Almost surely, 2^1143212240 is an apocalyptic number.

1143212240 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 1143212240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1392393024).

1143212240 is an abundant number, since it is smaller than the sum of its proper divisors (1641573808).

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

1143212240 is a wasteful number, since it uses less digits than its factorization.

1143212240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2556 (or 2550 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1143212240 is about 33811.4217388148. The cubic root of 1143212240 is about 1045.6241900199.

Adding to 1143212240 its reverse (422123411), we get a palindrome (1565335651).

The spelling of 1143212240 in words is "one billion, one hundred forty-three million, two hundred twelve thousand, two hundred forty".