1821180276 has 36 divisors (see below), whose sum is σ = 4690403172. Its totient is φ = 595605504.

The previous prime is 1821180259. The next prime is 1821180287. The reversal of 1821180276 is 6720811281.

It can be written as a sum of positive squares in 2 ways, for example, as 1463062500 + 358117776 = 38250^2 + 18924^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a self number, because there is not a number n which added to its sum of digits gives 1821180276.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 475341 + ... + 479156.

It is an arithmetic number, because the mean of its divisors is an integer number (130288977).

Almost surely, 2^1821180276 is an apocalyptic number.

It is an amenable number.

1821180276 is an abundant number, since it is smaller than the sum of its proper divisors (2869222896).

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

1821180276 is a wasteful number, since it uses less digits than its factorization.

1821180276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954560 (or 954555 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 1821180276 is about 42675.2888215182. The cubic root of 1821180276 is about 1221.1930182414.

The spelling of 1821180276 in words is "one billion, eight hundred twenty-one million, one hundred eighty thousand, two hundred seventy-six".