1897203891100 has 144 divisors (see below), whose sum is σ = 4910831686656. Its totient is φ = 622036800000.

The previous prime is 1897203891073. The next prime is 1897203891119. The reversal of 1897203891100 is 11983027981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 79699200 + ... + 79723000.

It is an arithmetic number, because the mean of its divisors is an integer number (34102997824).

Almost surely, 2^{1897203891100} is an apocalyptic number.

1897203891100 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 1897203891100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2455415843328).

1897203891100 is an abundant number, since it is smaller than the sum of its proper divisors (3013627795556).

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

1897203891100 is a wasteful number, since it uses less digits than its factorization.

1897203891100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28796 (or 28789 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 49.

The spelling of 1897203891100 in words is "one trillion, eight hundred ninety-seven billion, two hundred three million, eight hundred ninety-one thousand, one hundred".