3929643 has 6 divisors (see below), whose sum is σ = 5676164. Its totient is φ = 2619756.

The previous prime is 3929633. The next prime is 3929657. The reversal of 3929643 is 3469293.

It is a happy number.

3929643 is a `hidden beast` number, since 3 + 9 + 2 + 9 + 643 = 666.

It is not a de Polignac number, because 3929643 - 2⁹ = 3929131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3929598 and 3929607.

It is not an unprimeable number, because it can be changed into a prime (3929633) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 218305 + ... + 218322.

Almost surely, 2^3929643 is an apocalyptic number.

3929643 is a deficient number, since it is larger than the sum of its proper divisors (1746521).

3929643 is a wasteful number, since it uses less digits than its factorization.

3929643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436633 (or 436630 counting only the distinct ones).

The product of its digits is 34992, while the sum is 36.

The square root of 3929643 is about 1982.3327167759. The cubic root of 3929643 is about 157.8038879658.

The spelling of 3929643 in words is "three million, nine hundred twenty-nine thousand, six hundred forty-three".