1816821050 has 36 divisors (see below), whose sum is σ = 3714435438. Its totient is φ = 660660000.

The previous prime is 1816821031. The next prime is 1816821077. The reversal of 1816821050 is 501286181.

It can be written as a sum of positive squares in 3 ways, for example, as 1120441729 + 696379321 = 33473^2 + 26389^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1816820998 and 1816821016.

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 17 ways as a sum of consecutive naturals, for example, 144101 + ... + 156200.

Almost surely, 2^1816821050 is an apocalyptic number.

1816821050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1816821050 is an abundant number, since it is smaller than the sum of its proper divisors (1897614388).

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

1816821050 is a wasteful number, since it uses less digits than its factorization.

1816821050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300335 (or 300319 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 32.

The square root of 1816821050 is about 42624.1838631545. The cubic root of 1816821050 is about 1220.2178796569.

The spelling of 1816821050 in words is "one billion, eight hundred sixteen million, eight hundred twenty-one thousand, fifty".