1821045956 has 24 divisors (see below), whose sum is σ = 3356633280. Its totient is φ = 862067232.

The previous prime is 1821045931. The next prime is 1821045959. The reversal of 1821045956 is 6595401281.

It is not an unprimeable number, because it can be changed into a prime (1821045959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133886 + ... + 146858.

It is an arithmetic number, because the mean of its divisors is an integer number (139859720).

Almost surely, 2^1821045956 is an apocalyptic number.

It is an amenable number.

1821045956 is a deficient number, since it is larger than the sum of its proper divisors (1535587324).

1821045956 is a wasteful number, since it uses less digits than its factorization.

1821045956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14843 (or 14841 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 41.

The square root of 1821045956 is about 42673.7150480246. The cubic root of 1821045956 is about 1221.1629947302.

The spelling of 1821045956 in words is "one billion, eight hundred twenty-one million, forty-five thousand, nine hundred fifty-six".