3851643 has 4 divisors (see below), whose sum is σ = 5135528. Its totient is φ = 2567760.

The previous prime is 3851641. The next prime is 3851651. The reversal of 3851643 is 3461583.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 3851643 - 2¹ = 3851641 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3851643.

It is not an unprimeable number, because it can be changed into a prime (3851641) 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, 641938 + ... + 641943.

It is an arithmetic number, because the mean of its divisors is an integer number (1283882).

Almost surely, 2^3851643 is an apocalyptic number.

3851643 is a deficient number, since it is larger than the sum of its proper divisors (1283885).

3851643 is a wasteful number, since it uses less digits than its factorization.

3851643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283884.

The product of its digits is 8640, while the sum is 30.

The square root of 3851643 is about 1962.5603175444. The cubic root of 3851643 is about 156.7528126395.

It can be divided in two parts, 38 and 51643, that added together give a triangular number (51681 = T₃₂₁).

The spelling of 3851643 in words is "three million, eight hundred fifty-one thousand, six hundred forty-three".