4021847 has 4 divisors (see below), whose sum is σ = 4151616. Its totient is φ = 3892080.

The previous prime is 4021777. The next prime is 4021867. The reversal of 4021847 is 7481204.

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

It is a cyclic number.

It is not a de Polignac number, because 4021847 - 2¹⁶ = 3956311 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021867) 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, 64838 + ... + 64899.

It is an arithmetic number, because the mean of its divisors is an integer number (1037904).

Almost surely, 2^4021847 is an apocalyptic number.

4021847 is a deficient number, since it is larger than the sum of its proper divisors (129769).

4021847 is a wasteful number, since it uses less digits than its factorization.

4021847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129768.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 4021847 is about 2005.4543126185. The cubic root of 4021847 is about 159.0285802295.

The spelling of 4021847 in words is "four million, twenty-one thousand, eight hundred forty-seven".