3920981 has 2 divisors, whose sum is σ = 3920982. Its totient is φ = 3920980.

The previous prime is 3920977. The next prime is 3920989. The reversal of 3920981 is 1890293.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3740356 + 180625 = 1934^2 + 425^2 .

It is a cyclic number.

It is not a de Polignac number, because 3920981 - 2² = 3920977 is a prime.

It is a super-2 number, since 2×3920981² = 30748184004722, 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 (3920989) 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, 1960490 + 1960491.

It is an arithmetic number, because the mean of its divisors is an integer number (1960491).

Almost surely, 2^3920981 is an apocalyptic number.

It is an amenable number.

3920981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3920981 is an equidigital number, since it uses as much as digits as its factorization.

3920981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 3920981 is about 1980.1467117363. The cubic root of 3920981 is about 157.6878551314.

The spelling of 3920981 in words is "three million, nine hundred twenty thousand, nine hundred eighty-one".