4021816 has 16 divisors (see below), whose sum is σ = 7784640. Its totient is φ = 1945920.

The previous prime is 4021777. The next prime is 4021867. The reversal of 4021816 is 6181204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7861 + ... + 8356.

It is an arithmetic number, because the mean of its divisors is an integer number (486540).

Almost surely, 2^4021816 is an apocalyptic number.

It is an amenable number.

4021816 is a deficient number, since it is larger than the sum of its proper divisors (3762824).

4021816 is a wasteful number, since it uses less digits than its factorization.

4021816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16254 (or 16250 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 4021816 is about 2005.4465836815. The cubic root of 4021816 is about 159.0281716363.

The spelling of 4021816 in words is "four million, twenty-one thousand, eight hundred sixteen".