1821229132 has 12 divisors (see below), whose sum is σ = 3254963040. Its totient is φ = 891239696.

The previous prime is 1821229129. The next prime is 1821229177. The reversal of 1821229132 is 2319221281.

It is a junction number, because it is equal to n+sod(n) for n = 1821229094 and 1821229103.

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 3 ways as a sum of consecutive naturals, for example, 4843507 + ... + 4843882.

It is an arithmetic number, because the mean of its divisors is an integer number (271246920).

Almost surely, 2^1821229132 is an apocalyptic number.

It is an amenable number.

1821229132 is a deficient number, since it is larger than the sum of its proper divisors (1433733908).

1821229132 is a wasteful number, since it uses less digits than its factorization.

1821229132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9687440 (or 9687438 counting only the distinct ones).

The product of its digits is 3456, while the sum is 31.

The square root of 1821229132 is about 42675.8612332546. The cubic root of 1821229132 is about 1221.2039382792.

The spelling of 1821229132 in words is "one billion, eight hundred twenty-one million, two hundred twenty-nine thousand, one hundred thirty-two".