1155840720 has 40 divisors (see below), whose sum is σ = 3583106976. Its totient is φ = 308224128.

The previous prime is 1155840713. The next prime is 1155840787. The reversal of 1155840720 is 270485511.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2407762 + ... + 2408241.

Almost surely, 2^1155840720 is an apocalyptic number.

1155840720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155840720 is an abundant number, since it is smaller than the sum of its proper divisors (2427266256).

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

1155840720 is a wasteful number, since it uses less digits than its factorization.

1155840720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4816019 (or 4816013 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 33.

The square root of 1155840720 is about 33997.6575663677. The cubic root of 1155840720 is about 1049.4602577457.

The spelling of 1155840720 in words is "one billion, one hundred fifty-five million, eight hundred forty thousand, seven hundred twenty".