1821434756 has 12 divisors (see below), whose sum is σ = 3193632540. Its totient is φ = 908968320.

The previous prime is 1821434737. The next prime is 1821434761. The reversal of 1821434756 is 6574341281.

It can be written as a sum of positive squares in 2 ways, for example, as 926228356 + 895206400 = 30434^2 + 29920^2 .

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, 434921 + ... + 439088.

It is an arithmetic number, because the mean of its divisors is an integer number (266136045).

Almost surely, 2^1821434756 is an apocalyptic number.

It is an amenable number.

1821434756 is a deficient number, since it is larger than the sum of its proper divisors (1372197784).

1821434756 is a wasteful number, since it uses less digits than its factorization.

1821434756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874534 (or 874532 counting only the distinct ones).

The product of its digits is 161280, while the sum is 41.

The square root of 1821434756 is about 42678.2703023447. The cubic root of 1821434756 is about 1221.2498961407.

The spelling of 1821434756 in words is "one billion, eight hundred twenty-one million, four hundred thirty-four thousand, seven hundred fifty-six".