1143172220 has 48 divisors (see below), whose sum is σ = 2509593408. Its totient is φ = 436592640.

The previous prime is 1143172193. The next prime is 1143172229. The reversal of 1143172220 is 222713411.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143172229) 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, 292922 + ... + 296798.

It is an arithmetic number, because the mean of its divisors is an integer number (52283196).

Almost surely, 2^1143172220 is an apocalyptic number.

1143172220 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 1143172220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1254796704).

1143172220 is an abundant number, since it is smaller than the sum of its proper divisors (1366421188).

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

1143172220 is a wasteful number, since it uses less digits than its factorization.

1143172220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4550 (or 4548 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 1143172220 is about 33810.8299217869. The cubic root of 1143172220 is about 1045.6119886202.

Adding to 1143172220 its reverse (222713411), we get a palindrome (1365885631).

The spelling of 1143172220 in words is "one billion, one hundred forty-three million, one hundred seventy-two thousand, two hundred twenty".