1089099900 has 216 divisors, whose sum is σ = 4131298080. Its totient is φ = 234270720.

The previous prime is 1089099899. The next prime is 1089099929. The reversal of 1089099900 is 99909801.

It is a super-2 number, since 2×1089099900² = 2372277184360020000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 102016 + ... + 112184.

It is an arithmetic number, because the mean of its divisors is an integer number (19126380).

Almost surely, 2^1089099900 is an apocalyptic number.

1089099900 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 1089099900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2065649040).

1089099900 is an abundant number, since it is smaller than the sum of its proper divisors (3042198180).

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

1089099900 is a wasteful number, since it uses less digits than its factorization.

1089099900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10213 (or 10203 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 1089099900 is about 33001.5136016517. The cubic root of 1089099900 is about 1028.8591068672.

The spelling of 1089099900 in words is "one billion, eighty-nine million, ninety-nine thousand, nine hundred".