3849821 has 2 divisors, whose sum is σ = 3849822. Its totient is φ = 3849820.

The previous prime is 3849793. The next prime is 3849823. The reversal of 3849821 is 1289483.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2937796 + 912025 = 1714^2 + 955^2 .

It is a cyclic number.

It is not a de Polignac number, because 3849821 - 2⁶ = 3849757 is a prime.

It is a super-2 number, since 2×3849821² = 29642243464082, which contains 22 as substring.

Together with 3849823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3849823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1924910 + 1924911.

It is an arithmetic number, because the mean of its divisors is an integer number (1924911).

Almost surely, 2^3849821 is an apocalyptic number.

It is an amenable number.

3849821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3849821 is an equidigital number, since it uses as much as digits as its factorization.

3849821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 35.

The square root of 3849821 is about 1962.0960730810. The cubic root of 3849821 is about 156.7280917026.

The spelling of 3849821 in words is "three million, eight hundred forty-nine thousand, eight hundred twenty-one".