1143775644 has 96 divisors (see below), whose sum is σ = 3002904576. Its totient is φ = 335858880.

The previous prime is 1143775639. The next prime is 1143775649. The reversal of 1143775644 is 4465773411.

It is an interprime number because it is at equal distance from previous prime (1143775639) and next prime (1143775649).

It is a super-2 number, since 2×1143775644² = 2616445447615229472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1143775596 and 1143775605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143775649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 662967 + ... + 664689.

It is an arithmetic number, because the mean of its divisors is an integer number (31280256).

Almost surely, 2^1143775644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1143775644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1501452288).

1143775644 is an abundant number, since it is smaller than the sum of its proper divisors (1859128932).

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

1143775644 is a wasteful number, since it uses less digits than its factorization.

1143775644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1895 (or 1893 counting only the distinct ones).

The product of its digits is 282240, while the sum is 42.

The square root of 1143775644 is about 33819.7522758521. The cubic root of 1143775644 is about 1045.7959318543.

It can be divided in two parts, 114377 and 5644, that added together give a palindrome (120021).

The spelling of 1143775644 in words is "one billion, one hundred forty-three million, seven hundred seventy-five thousand, six hundred forty-four".