3782021 has 2 divisors, whose sum is σ = 3782022. Its totient is φ = 3782020.

The previous prime is 3782011. The next prime is 3782039. The reversal of 3782021 is 1202873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3724900 + 57121 = 1930^2 + 239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3782021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3782011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1891010 + 1891011.

It is an arithmetic number, because the mean of its divisors is an integer number (1891011).

Almost surely, 2^3782021 is an apocalyptic number.

It is an amenable number.

3782021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3782021 is an equidigital number, since it uses as much as digits as its factorization.

3782021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 3782021 is about 1944.7418851868. The cubic root of 3782021 is about 155.8025800950.

Adding to 3782021 its reverse (1202873), we get a palindrome (4984894).

The spelling of 3782021 in words is "three million, seven hundred eighty-two thousand, twenty-one".