1798790621 has 6 divisors (see below), whose sum is σ = 1910826330. Its totient is φ = 1692979136.

The previous prime is 1798790599. The next prime is 1798790639. The reversal of 1798790621 is 1260978971.

It can be written as a sum of positive squares in 3 ways, for example, as 179935396 + 1618855225 = 13414^2 + 40235^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1798790621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1798790621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1798790821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3111806 + ... + 3112383.

It is an arithmetic number, because the mean of its divisors is an integer number (318471055).

Almost surely, 2^1798790621 is an apocalyptic number.

It is an amenable number.

1798790621 is a deficient number, since it is larger than the sum of its proper divisors (112035709).

1798790621 is an equidigital number, since it uses as much as digits as its factorization.

1798790621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6224223 (or 6224206 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 50.

The square root of 1798790621 is about 42412.1518081787. The cubic root of 1798790621 is about 1216.1679052126.

The spelling of 1798790621 in words is "one billion, seven hundred ninety-eight million, seven hundred ninety thousand, six hundred twenty-one".