1621796818 has 8 divisors (see below), whose sum is σ = 2435368320. Its totient is φ = 810007380.

The previous prime is 1621796809. The next prime is 1621796819. The reversal of 1621796818 is 8186971261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1621796819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 443238 + ... + 446881.

It is an arithmetic number, because the mean of its divisors is an integer number (304421040).

Almost surely, 2^1621796818 is an apocalyptic number.

1621796818 is a deficient number, since it is larger than the sum of its proper divisors (813571502).

1621796818 is an equidigital number, since it uses as much as digits as its factorization.

1621796818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891032.

The product of its digits is 290304, while the sum is 49.

The square root of 1621796818 is about 40271.5385601295. The cubic root of 1621796818 is about 1174.8943482491.

The spelling of 1621796818 in words is "one billion, six hundred twenty-one million, seven hundred ninety-six thousand, eight hundred eighteen".