12001097898 has 48 divisors (see below), whose sum is σ = 27070528680. Its totient is φ = 3837794688.

The previous prime is 12001097897. The next prime is 12001097909. The reversal of 12001097898 is 89879010021.

It can be written as a sum of positive squares in 4 ways, for example, as 10899986409 + 1101111489 = 104403^2 + 33183^2 .

It is not an unprimeable number, because it can be changed into a prime (12001097891) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8736 + ... + 155172.

Almost surely, 2^12001097898 is an apocalyptic number.

12001097898 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12001097898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13535264340).

12001097898 is an abundant number, since it is smaller than the sum of its proper divisors (15069430782).

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

12001097898 is a wasteful number, since it uses less digits than its factorization.

12001097898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146631 (or 146628 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 45.

The spelling of 12001097898 in words is "twelve billion, one million, ninety-seven thousand, eight hundred ninety-eight".