1158997000 has 256 divisors, whose sum is σ = 3294720000. Its totient is φ = 381024000.

The previous prime is 1158996997. The next prime is 1158997001. The reversal of 1158997000 is 7998511.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (1158997001) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10632946 + ... + 10633054.

It is an arithmetic number, because the mean of its divisors is an integer number (12870000).

Almost surely, 2^1158997000 is an apocalyptic number.

1158997000 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 1158997000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1647360000).

1158997000 is an abundant number, since it is smaller than the sum of its proper divisors (2135723000).

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

1158997000 is a wasteful number, since it uses less digits than its factorization.

1158997000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 1158997000 is about 34044.0450005577. The cubic root of 1158997000 is about 1050.4146510452.

The spelling of 1158997000 in words is "one billion, one hundred fifty-eight million, nine hundred ninety-seven thousand".