1155438140 has 24 divisors (see below), whose sum is σ = 2427577152. Its totient is φ = 461954880.

The previous prime is 1155438131. The next prime is 1155438187. The reversal of 1155438140 is 418345511.

It is a junction number, because it is equal to n+sod(n) for n = 1155438097 and 1155438106.

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, 33110 + ... + 58370.

It is an arithmetic number, because the mean of its divisors is an integer number (101149048).

Almost surely, 2^1155438140 is an apocalyptic number.

1155438140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155438140 is an abundant number, since it is smaller than the sum of its proper divisors (1272139012).

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

1155438140 is a wasteful number, since it uses less digits than its factorization.

1155438140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27557 (or 27555 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 1155438140 is about 33991.7363487069. The cubic root of 1155438140 is about 1049.3384010561.

It can be divided in two parts, 11554 and 38140, that added together give a palindrome (49694).

The spelling of 1155438140 in words is "one billion, one hundred fifty-five million, four hundred thirty-eight thousand, one hundred forty".