3949657 has 2 divisors, whose sum is σ = 3949658. Its totient is φ = 3949656.

The previous prime is 3949651. The next prime is 3949669. The reversal of 3949657 is 7569493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3316041 + 633616 = 1821^2 + 796^2 .

It is a cyclic number.

It is not a de Polignac number, because 3949657 - 2⁷ = 3949529 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3949651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1974828 + 1974829.

It is an arithmetic number, because the mean of its divisors is an integer number (1974829).

Almost surely, 2^3949657 is an apocalyptic number.

It is an amenable number.

3949657 is a deficient number, since it is larger than the sum of its proper divisors (1).

3949657 is an equidigital number, since it uses as much as digits as its factorization.

3949657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 43.

The square root of 3949657 is about 1987.3743985470. The cubic root of 3949657 is about 158.0713372250.

The spelling of 3949657 in words is "three million, nine hundred forty-nine thousand, six hundred fifty-seven".