1153555440 has 160 divisors (see below), whose sum is σ = 3641433600. Its totient is φ = 302054400.

The previous prime is 1153555421. The next prime is 1153555457. The reversal of 1153555440 is 445553511.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5037246 + ... + 5037474.

It is an arithmetic number, because the mean of its divisors is an integer number (22758960).

Almost surely, 2^1153555440 is an apocalyptic number.

1153555440 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 1153555440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1820716800).

1153555440 is an abundant number, since it is smaller than the sum of its proper divisors (2487878160).

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

1153555440 is a wasteful number, since it uses less digits than its factorization.

1153555440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535 (or 529 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 33.

The square root of 1153555440 is about 33964.0315628166. The cubic root of 1153555440 is about 1048.7681517465.

The spelling of 1153555440 in words is "one billion, one hundred fifty-three million, five hundred fifty-five thousand, four hundred forty".