1155405540 has 24 divisors (see below), whose sum is σ = 3235135680. Its totient is φ = 308108128.

The previous prime is 1155405539. The next prime is 1155405569. The reversal of 1155405540 is 455045511.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1155405498 and 1155405507.

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, 9628320 + ... + 9628439.

It is an arithmetic number, because the mean of its divisors is an integer number (134797320).

Almost surely, 2^1155405540 is an apocalyptic number.

1155405540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155405540 is an abundant number, since it is smaller than the sum of its proper divisors (2079730140).

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

1155405540 is a wasteful number, since it uses less digits than its factorization.

1155405540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19256771 (or 19256769 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 30.

The square root of 1155405540 is about 33991.2568170110. The cubic root of 1155405540 is about 1049.3285321437.

The spelling of 1155405540 in words is "one billion, one hundred fifty-five million, four hundred five thousand, five hundred forty".