1158781440 has 80 divisors (see below), whose sum is σ = 3704503968. Its totient is φ = 309006336.

The previous prime is 1158781411. The next prime is 1158781447. The reversal of 1158781440 is 441878511.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (1158781447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67762 + ... + 83121.

Almost surely, 2^1158781440 is an apocalyptic number.

1158781440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1158781440 is an abundant number, since it is smaller than the sum of its proper divisors (2545722528).

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

1158781440 is an equidigital number, since it uses as much as digits as its factorization.

1158781440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150909 (or 150893 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 1158781440 is about 34040.8789545746. The cubic root of 1158781440 is about 1050.3495253600.

The spelling of 1158781440 in words is "one billion, one hundred fifty-eight million, seven hundred eighty-one thousand, four hundred forty".