3865943 has 2 divisors, whose sum is σ = 3865944. Its totient is φ = 3865942.

The previous prime is 3865933. The next prime is 3865951. The reversal of 3865943 is 3495683.

It is a strong prime.

It is an emirp because it is prime and its reverse (3495683) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3865943 - 2¹⁸ = 3603799 is a prime.

It is a super-3 number, since 3×3865943³ (a number of 21 digits) contains 333 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 3865897 and 3865906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3865913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1932971 + 1932972.

It is an arithmetic number, because the mean of its divisors is an integer number (1932972).

Almost surely, 2^3865943 is an apocalyptic number.

3865943 is a deficient number, since it is larger than the sum of its proper divisors (1).

3865943 is an equidigital number, since it uses as much as digits as its factorization.

3865943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 38.

The square root of 3865943 is about 1966.2001424067. The cubic root of 3865943 is about 156.9465651793.

The spelling of 3865943 in words is "three million, eight hundred sixty-five thousand, nine hundred forty-three".