1155540240 has 120 divisors (see below), whose sum is σ = 4049472960. Its totient is φ = 294742272.

The previous prime is 1155540209. The next prime is 1155540241. The reversal of 1155540240 is 420455511.

1155540240 is a `hidden beast` number, since 115 + 5 + 540 + 2 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is not an unprimeable number, because it can be changed into a prime (1155540241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18330 + ... + 51449.

It is an arithmetic number, because the mean of its divisors is an integer number (33745608).

Almost surely, 2^1155540240 is an apocalyptic number.

1155540240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155540240 is an abundant number, since it is smaller than the sum of its proper divisors (2893932720).

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

1155540240 is a wasteful number, since it uses less digits than its factorization.

1155540240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69821 (or 69812 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 1155540240 is about 33993.2381511382. The cubic root of 1155540240 is about 1049.3693083202.

Adding to 1155540240 its reverse (420455511), we get a palindrome (1575995751).

The spelling of 1155540240 in words is "one billion, one hundred fifty-five million, five hundred forty thousand, two hundred forty".