1143243420 has 192 divisors, whose sum is σ = 3660152832. Its totient is φ = 264096000.

The previous prime is 1143243403. The next prime is 1143243461. The reversal of 1143243420 is 243423411.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1452267 + ... + 1453053.

It is an arithmetic number, because the mean of its divisors is an integer number (19063296).

Almost surely, 2^1143243420 is an apocalyptic number.

1143243420 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 1143243420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1830076416).

1143243420 is an abundant number, since it is smaller than the sum of its proper divisors (2516909412).

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

1143243420 is a wasteful number, since it uses less digits than its factorization.

1143243420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912 (or 910 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 1143243420 is about 33811.8828224635. The cubic root of 1143243420 is about 1045.6336960605.

Adding to 1143243420 its reverse (243423411), we get a palindrome (1386666831).

Subtracting from 1143243420 its reverse (243423411), we obtain a square (899820009 = 29997²).

The spelling of 1143243420 in words is "one billion, one hundred forty-three million, two hundred forty-three thousand, four hundred twenty".