1155535540 has 96 divisors (see below), whose sum is σ = 2654346240. Its totient is φ = 420940800.

The previous prime is 1155535531. The next prime is 1155535541. The reversal of 1155535540 is 455355511.

It is a junction number, because it is equal to n+sod(n) for n = 1155535496 and 1155535505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155535541) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 2744530 + ... + 2744950.

It is an arithmetic number, because the mean of its divisors is an integer number (27649440).

Almost surely, 2^1155535540 is an apocalyptic number.

1155535540 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 1155535540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1327173120).

1155535540 is an abundant number, since it is smaller than the sum of its proper divisors (1498810700).

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

1155535540 is a wasteful number, since it uses less digits than its factorization.

1155535540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713 (or 711 counting only the distinct ones).

The product of its (nonzero) digits is 37500, while the sum is 34.

The square root of 1155535540 is about 33993.1690196722. The cubic root of 1155535540 is about 1049.3678855968.

The spelling of 1155535540 in words is "one billion, one hundred fifty-five million, five hundred thirty-five thousand, five hundred forty".