3857643 has 12 divisors (see below), whose sum is σ = 5651568. Its totient is φ = 2535120.

The previous prime is 3857641. The next prime is 3857663. The reversal of 3857643 is 3467583.

It is a happy number.

3857643 is a `hidden beast` number, since 3 + 8 + 5 + 7 + 643 = 666.

It is not a de Polignac number, because 3857643 - 2¹ = 3857641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3857598 and 3857607.

It is not an unprimeable number, because it can be changed into a prime (3857641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2380 + ... + 3657.

It is an arithmetic number, because the mean of its divisors is an integer number (470964).

Almost surely, 2^3857643 is an apocalyptic number.

3857643 is a deficient number, since it is larger than the sum of its proper divisors (1793925).

3857643 is a wasteful number, since it uses less digits than its factorization.

3857643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6114 (or 6111 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 3857643 is about 1964.0883381355. The cubic root of 3857643 is about 156.8341657077.

The spelling of 3857643 in words is "three million, eight hundred fifty-seven thousand, six hundred forty-three".