3821947 has 2 divisors, whose sum is σ = 3821948. Its totient is φ = 3821946.

The previous prime is 3821929. The next prime is 3821953. The reversal of 3821947 is 7491283.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3821947 - 2⁷ = 3821819 is a prime.

It is not a weakly prime, because it can be changed into another prime (3821347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1910973 + 1910974.

It is an arithmetic number, because the mean of its divisors is an integer number (1910974).

Almost surely, 2^3821947 is an apocalyptic number.

3821947 is a deficient number, since it is larger than the sum of its proper divisors (1).

3821947 is an equidigital number, since it uses as much as digits as its factorization.

3821947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 3821947 is about 1954.9800510491. The cubic root of 3821947 is about 156.3489204012.

It can be divided in two parts, 38 and 21947, that multiplied together give a triangular number (833986 = T₁₂₉₁).

The spelling of 3821947 in words is "three million, eight hundred twenty-one thousand, nine hundred forty-seven".