3946981 has 2 divisors, whose sum is σ = 3946982. Its totient is φ = 3946980.

The previous prime is 3946939. The next prime is 3946991. The reversal of 3946981 is 1896493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2056356 + 1890625 = 1434^2 + 1375^2 .

It is a cyclic number.

It is not a de Polignac number, because 3946981 - 2⁷ = 3946853 is a prime.

It is a super-2 number, since 2×3946981² = 31157318028722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3946991) 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, 1973490 + 1973491.

It is an arithmetic number, because the mean of its divisors is an integer number (1973491).

Almost surely, 2^3946981 is an apocalyptic number.

3946981 is the 1257-th centered pentagonal number.

It is an amenable number.

3946981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3946981 is an equidigital number, since it uses as much as digits as its factorization.

3946981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 40.

The square root of 3946981 is about 1986.7010343783. The cubic root of 3946981 is about 158.0356299500.

The spelling of 3946981 in words is "three million, nine hundred forty-six thousand, nine hundred eighty-one".