3969843 has 4 divisors (see below), whose sum is σ = 5293128. Its totient is φ = 2646560.

The previous prime is 3969827. The next prime is 3969853. The reversal of 3969843 is 3489693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3489693 = 3 ⋅1163231.

It is a cyclic number.

It is not a de Polignac number, because 3969843 - 2⁴ = 3969827 is a prime.

It is a D-number.

3969843 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3969795 and 3969804.

It is not an unprimeable number, because it can be changed into a prime (3969853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661638 + ... + 661643.

It is an arithmetic number, because the mean of its divisors is an integer number (1323282).

Almost surely, 2^3969843 is an apocalyptic number.

3969843 is a deficient number, since it is larger than the sum of its proper divisors (1323285).

3969843 is a wasteful number, since it uses less digits than its factorization.

3969843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323284.

The product of its digits is 139968, while the sum is 42.

The square root of 3969843 is about 1992.4464861070. The cubic root of 3969843 is about 158.3401713267.

The spelling of 3969843 in words is "three million, nine hundred sixty-nine thousand, eight hundred forty-three".