3782790821 has 2 divisors, whose sum is σ = 3782790822. Its totient is φ = 3782790820.

The previous prime is 3782790799. The next prime is 3782790863. The reversal of 3782790821 is 1280972873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2727450625 + 1055340196 = 52225^2 + 32486^2 .

It is an emirp because it is prime and its reverse (1280972873) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3782790821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3782490821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1891395410 + 1891395411.

It is an arithmetic number, because the mean of its divisors is an integer number (1891395411).

Almost surely, 2^3782790821 is an apocalyptic number.

It is an amenable number.

3782790821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3782790821 is an equidigital number, since it uses as much as digits as its factorization.

3782790821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 3782790821 is about 61504.3967615324. The cubic root of 3782790821 is about 1558.1315045413.

The spelling of 3782790821 in words is "three billion, seven hundred eighty-two million, seven hundred ninety thousand, eight hundred twenty-one".