1821746856 has 16 divisors (see below), whose sum is σ = 4554367200. Its totient is φ = 607248944.

The previous prime is 1821746833. The next prime is 1821746863. The reversal of 1821746856 is 6586471281.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37953036 + ... + 37953083.

It is an arithmetic number, because the mean of its divisors is an integer number (284647950).

Almost surely, 2^1821746856 is an apocalyptic number.

It is an amenable number.

1821746856 is an abundant number, since it is smaller than the sum of its proper divisors (2732620344).

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

1821746856 is a wasteful number, since it uses less digits than its factorization.

1821746856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75906128 (or 75906124 counting only the distinct ones).

The product of its digits is 645120, while the sum is 48.

The square root of 1821746856 is about 42681.9265731996. The cubic root of 1821746856 is about 1221.3196452444.

The spelling of 1821746856 in words is "one billion, eight hundred twenty-one million, seven hundred forty-six thousand, eight hundred fifty-six".