1806189642972 has 576 divisors, whose sum is σ = 5752974689280. Its totient is φ = 473584320000.

The previous prime is 1806189642941. The next prime is 1806189643001. The reversal of 1806189642972 is 2792469816081.

1806189642972 is a `hidden beast` number, since 1 + 8 + 0 + 61 + 89 + 6 + 429 + 72 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1195359697 + ... + 1195361207.

It is an arithmetic number, because the mean of its divisors is an integer number (9987803280).

Almost surely, 2^{1806189642972} is an apocalyptic number.

1806189642972 is a gapful number since it is divisible by the number (12) 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 1806189642972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2876487344640).

1806189642972 is an abundant number, since it is smaller than the sum of its proper divisors (3946785046308).

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

1806189642972 is a wasteful number, since it uses less digits than its factorization.

1806189642972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1687 (or 1660 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 63.

The spelling of 1806189642972 in words is "one trillion, eight hundred six billion, one hundred eighty-nine million, six hundred forty-two thousand, nine hundred seventy-two".