1155890000 has 50 divisors (see below), whose sum is σ = 2798549490.
Its totient is φ = 462352000.
The previous prime is 1155889979. The next prime is 1155890003. The reversal of 1155890000 is 985511.
It can be written as a sum of positive squares in 5 ways, for example, as 223442704 + 932447296 = 14948^2 + 30536^2
It is a tau number, because it is divible by the number of its divisors (50).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1155890003) by changing a digit.
It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 47795 + ... + 67794.
Almost surely, 21155890000 is an apocalyptic number.
1155890000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
1155890000 is an abundant number, since it is smaller than the sum of its proper divisors (1642659490).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1155890000 is an equidigital number, since it uses as much as digits as its factorization.
1155890000 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 115617 (or 115596 counting only the distinct ones).
The product of its (nonzero) digits is 1800, while the sum is 29.
The square root of 1155890000 is about 33998.3823144573.
The cubic root of 1155890000 is about 1049.4751723343.
The spelling of 1155890000 in words is "one billion, one hundred fifty-five million, eight hundred ninety thousand".