1153644646 has 16 divisors (see below), whose sum is σ = 2157465600. Its totient is φ = 449471880.

The previous prime is 1153644643. The next prime is 1153644671. The reversal of 1153644646 is 6464463511.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1153644599 and 1153644608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1153644643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3745446 + ... + 3745753.

It is an arithmetic number, because the mean of its divisors is an integer number (134841600).

Almost surely, 2^1153644646 is an apocalyptic number.

1153644646 is a deficient number, since it is larger than the sum of its proper divisors (1003820954).

1153644646 is a wasteful number, since it uses less digits than its factorization.

1153644646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7491219.

The product of its digits is 207360, while the sum is 40.

The square root of 1153644646 is about 33965.3447796427. The cubic root of 1153644646 is about 1048.7951852688.

The spelling of 1153644646 in words is "one billion, one hundred fifty-three million, six hundred forty-four thousand, six hundred forty-six".