1982171700 has 54 divisors (see below), whose sum is σ = 6213009894. Its totient is φ = 528578880.

The previous prime is 1982171669. The next prime is 1982171747. The reversal of 1982171700 is 71712891.

It can be written as a sum of positive squares in 3 ways, for example, as 357436836 + 1624734864 = 18906^2 + 40308^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1100307 + ... + 1102106.

Almost surely, 2^1982171700 is an apocalyptic number.

1982171700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1982171700 is an abundant number, since it is smaller than the sum of its proper divisors (4230838194).

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

1982171700 is a wasteful number, since it uses less digits than its factorization.

1982171700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2202433 (or 2202423 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 36.

The square root of 1982171700 is about 44521.5868989415. The cubic root of 1982171700 is about 1256.1661620742.

The spelling of 1982171700 in words is "one billion, nine hundred eighty-two million, one hundred seventy-one thousand, seven hundred".