1981902700 has 18 divisors (see below), whose sum is σ = 4300729076. Its totient is φ = 792761040.

The previous prime is 1981902697. The next prime is 1981902707. The reversal of 1981902700 is 72091891.

It is a self number, because there is not a number n which added to its sum of digits gives 1981902700.

It is not an unprimeable number, because it can be changed into a prime (1981902707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9909414 + ... + 9909613.

Almost surely, 2^1981902700 is an apocalyptic number.

1981902700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1981902700 is an abundant number, since it is smaller than the sum of its proper divisors (2318826376).

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

1981902700 is a wasteful number, since it uses less digits than its factorization.

1981902700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19819041 (or 19819034 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 1981902700 is about 44518.5657900162. The cubic root of 1981902700 is about 1256.1093348436.

The spelling of 1981902700 in words is "one billion, nine hundred eighty-one million, nine hundred two thousand, seven hundred".