3909943 has 2 divisors, whose sum is σ = 3909944. Its totient is φ = 3909942.

The previous prime is 3909923. The next prime is 3909959. The reversal of 3909943 is 3499093.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3909943 - 2⁵ = 3909911 is a prime.

3909943 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3909923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1954971 + 1954972.

It is an arithmetic number, because the mean of its divisors is an integer number (1954972).

Almost surely, 2^3909943 is an apocalyptic number.

3909943 is a deficient number, since it is larger than the sum of its proper divisors (1).

3909943 is an equidigital number, since it uses as much as digits as its factorization.

3909943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 3909943 is about 1977.3575802065. The cubic root of 3909943 is about 157.5397464146.

The spelling of 3909943 in words is "three million, nine hundred nine thousand, nine hundred forty-three".