3970781 has 2 divisors, whose sum is σ = 3970782. Its totient is φ = 3970780.

The previous prime is 3970763. The next prime is 3970787. The reversal of 3970781 is 1870793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3865156 + 105625 = 1966^2 + 325^2 .

It is an emirp because it is prime and its reverse (1870793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3970781 - 2¹⁴ = 3954397 is a prime.

It is a super-2 number, since 2×3970781² = 31534203499922, 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 (3970787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1985390 + 1985391.

It is an arithmetic number, because the mean of its divisors is an integer number (1985391).

Almost surely, 2^3970781 is an apocalyptic number.

It is an amenable number.

3970781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3970781 is an equidigital number, since it uses as much as digits as its factorization.

3970781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 3970781 is about 1992.6818612112. The cubic root of 3970781 is about 158.3526412896.

The spelling of 3970781 in words is "three million, nine hundred seventy thousand, seven hundred eighty-one".