1155545440 has 72 divisors (see below), whose sum is σ = 3175708032. Its totient is φ = 396184320.

The previous prime is 1155545389. The next prime is 1155545453. The reversal of 1155545440 is 445455511.

It is a junction number, because it is equal to n+sod(n) for n = 1155545396 and 1155545405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65856 + ... + 81535.

It is an arithmetic number, because the mean of its divisors is an integer number (44107056).

Almost surely, 2^1155545440 is an apocalyptic number.

1155545440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155545440 is an abundant number, since it is smaller than the sum of its proper divisors (2020162592).

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

1155545440 is a wasteful number, since it uses less digits than its factorization.

1155545440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147420 (or 147405 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 34.

The square root of 1155545440 is about 33993.3146368518. The cubic root of 1155545440 is about 1049.3708823927.

The spelling of 1155545440 in words is "one billion, one hundred fifty-five million, five hundred forty-five thousand, four hundred forty".