1821227850 has 144 divisors (see below), whose sum is σ = 5579689752. Its totient is φ = 421908480.

The previous prime is 1821227819. The next prime is 1821227873. The reversal of 1821227850 is 587221281.

It can be written as a sum of positive squares in 12 ways, for example, as 8767521 + 1812460329 = 2961^2 + 42573^2 .

It is a congruent number.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 90294 + ... + 108606.

Almost surely, 2^1821227850 is an apocalyptic number.

1821227850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1821227850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2789844876).

1821227850 is an abundant number, since it is smaller than the sum of its proper divisors (3758461902).

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

1821227850 is a wasteful number, since it uses less digits than its factorization.

1821227850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18361 (or 18353 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 1821227850 is about 42675.8462130512. The cubic root of 1821227850 is about 1221.2036517358.

The spelling of 1821227850 in words is "one billion, eight hundred twenty-one million, two hundred twenty-seven thousand, eight hundred fifty".