1890799821 has 8 divisors (see below), whose sum is σ = 2801184960. Its totient is φ = 1260533196.

The previous prime is 1890799811. The next prime is 1890799861. The reversal of 1890799821 is 1289970981.

It is not a de Polignac number, because 1890799821 - 2¹¹ = 1890797773 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1890799811) 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, 35014785 + ... + 35014838.

It is an arithmetic number, because the mean of its divisors is an integer number (350148120).

Almost surely, 2^1890799821 is an apocalyptic number.

It is an amenable number.

1890799821 is a deficient number, since it is larger than the sum of its proper divisors (910385139).

1890799821 is an equidigital number, since it uses as much as digits as its factorization.

1890799821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70029632 (or 70029626 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 54.

The square root of 1890799821 is about 43483.3280810013. The cubic root of 1890799821 is about 1236.5599722525.

The spelling of 1890799821 in words is "one billion, eight hundred ninety million, seven hundred ninety-nine thousand, eight hundred twenty-one".