3891893 has 2 divisors, whose sum is σ = 3891894. Its totient is φ = 3891892.

The previous prime is 3891883. The next prime is 3891907. The reversal of 3891893 is 3981983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3659569 + 232324 = 1913^2 + 482^2 .

It is a cyclic number.

It is not a de Polignac number, because 3891893 - 2¹⁸ = 3629749 is a prime.

It is a super-2 number, since 2×3891893² = 30293662246898, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3891893.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3891803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1945946 + 1945947.

It is an arithmetic number, because the mean of its divisors is an integer number (1945947).

Almost surely, 2^3891893 is an apocalyptic number.

It is an amenable number.

3891893 is a deficient number, since it is larger than the sum of its proper divisors (1).

3891893 is an equidigital number, since it uses as much as digits as its factorization.

3891893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 41.

The square root of 3891893 is about 1972.7881285125. The cubic root of 3891893 is about 157.2969483795.

The spelling of 3891893 in words is "three million, eight hundred ninety-one thousand, eight hundred ninety-three".