3943789 has 4 divisors (see below), whose sum is σ = 4071040. Its totient is φ = 3816540.

The previous prime is 3943777. The next prime is 3943799. The reversal of 3943789 is 9873493.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9873493 = 7 ⋅1410499.

It is a cyclic number.

It is not a de Polignac number, because 3943789 - 2⁵ = 3943757 is a prime.

It is a Duffinian number.

3943789 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3943769) 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 in 3 ways as a sum of consecutive naturals, for example, 63579 + ... + 63640.

It is an arithmetic number, because the mean of its divisors is an integer number (1017760).

Almost surely, 2^3943789 is an apocalyptic number.

It is an amenable number.

3943789 is a deficient number, since it is larger than the sum of its proper divisors (127251).

3943789 is a wasteful number, since it uses less digits than its factorization.

3943789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127250.

The product of its digits is 163296, while the sum is 43.

The square root of 3943789 is about 1985.8975300856. The cubic root of 3943789 is about 157.9930163019.

The spelling of 3943789 in words is "three million, nine hundred forty-three thousand, seven hundred eighty-nine".