1143640386 has 48 divisors (see below), whose sum is σ = 2846757888. Its totient is φ = 325036800.

The previous prime is 1143640373. The next prime is 1143640409. The reversal of 1143640386 is 6830463411.

It is a happy number.

1143640386 is a `hidden beast` number, since 1 + 1 + 4 + 3 + 640 + 3 + 8 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1143640386.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 306 + ... + 47826.

It is an arithmetic number, because the mean of its divisors is an integer number (59307456).

Almost surely, 2^1143640386 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1143640386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1423378944).

1143640386 is an abundant number, since it is smaller than the sum of its proper divisors (1703117502).

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

1143640386 is a wasteful number, since it uses less digits than its factorization.

1143640386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47727 (or 47724 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 1143640386 is about 33817.7525273339. The cubic root of 1143640386 is about 1045.7547064494.

The spelling of 1143640386 in words is "one billion, one hundred forty-three million, six hundred forty thousand, three hundred eighty-six".