3948809 has 2 divisors, whose sum is σ = 3948810. Its totient is φ = 3948808.

The previous prime is 3948803. The next prime is 3948817. The reversal of 3948809 is 9088493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3888784 + 60025 = 1972^2 + 245^2 .

It is a cyclic number.

It is not a de Polignac number, because 3948809 - 2¹⁶ = 3883273 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (3948803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1974404 + 1974405.

It is an arithmetic number, because the mean of its divisors is an integer number (1974405).

Almost surely, 2^3948809 is an apocalyptic number.

It is an amenable number.

3948809 is a deficient number, since it is larger than the sum of its proper divisors (1).

3948809 is an equidigital number, since it uses as much as digits as its factorization.

3948809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 3948809 is about 1987.1610402783. The cubic root of 3948809 is about 158.0600236612.

The spelling of 3948809 in words is "three million, nine hundred forty-eight thousand, eight hundred nine".