3997811 has 2 divisors, whose sum is σ = 3997812. Its totient is φ = 3997810.

The previous prime is 3997801. The next prime is 3997849. The reversal of 3997811 is 1187993.

It is an a-pointer prime, because the next prime (3997849) can be obtained adding 3997811 to its sum of digits (38).

It is a weak prime.

It is an emirp because it is prime and its reverse (1187993) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3997811 is a prime.

It is an Ulam number.

It is equal to p₂₈₂₉₉₈ and since 3997811 and 282998 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (3997801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1998905 + 1998906.

It is an arithmetic number, because the mean of its divisors is an integer number (1998906).

Almost surely, 2^3997811 is an apocalyptic number.

3997811 is a deficient number, since it is larger than the sum of its proper divisors (1).

3997811 is an equidigital number, since it uses as much as digits as its factorization.

3997811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 38.

The square root of 3997811 is about 1999.4526751089. The cubic root of 3997811 is about 158.7111430721.

The spelling of 3997811 in words is "three million, nine hundred ninety-seven thousand, eight hundred eleven".