3918881 has 2 divisors, whose sum is σ = 3918882. Its totient is φ = 3918880.

The previous prime is 3918869. The next prime is 3918899. The reversal of 3918881 is 1888193.

3918881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2430481 + 1488400 = 1559^2 + 1220^2 .

It is an emirp because it is prime and its reverse (1888193) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3918881 is a prime.

It is a super-2 number, since 2×3918881² = 30715256584322, which contains 22 as substring.

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 (3918851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1959440 + 1959441.

It is an arithmetic number, because the mean of its divisors is an integer number (1959441).

Almost surely, 2^3918881 is an apocalyptic number.

It is an amenable number.

3918881 is a deficient number, since it is larger than the sum of its proper divisors (1).

3918881 is an equidigital number, since it uses as much as digits as its factorization.

3918881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 38.

The square root of 3918881 is about 1979.6163769781. The cubic root of 3918881 is about 157.6596986036.

The spelling of 3918881 in words is "three million, nine hundred eighteen thousand, eight hundred eighty-one".