1981895300 has 108 divisors (see below), whose sum is σ = 5402779200. Its totient is φ = 617707200.

The previous prime is 1981895299. The next prime is 1981895341. The reversal of 1981895300 is 35981891.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 73001 + ... + 96399.

Almost surely, 2^1981895300 is an apocalyptic number.

1981895300 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 1981895300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2701389600).

1981895300 is an abundant number, since it is smaller than the sum of its proper divisors (3420883900).

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

1981895300 is a wasteful number, since it uses less digits than its factorization.

1981895300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23442 (or 23424 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 44.

The square root of 1981895300 is about 44518.4826785460. The cubic root of 1981895300 is about 1256.1077714940.

The spelling of 1981895300 in words is "one billion, nine hundred eighty-one million, eight hundred ninety-five thousand, three hundred".