4021818 has 8 divisors (see below), whose sum is σ = 8043648. Its totient is φ = 1340604.

The previous prime is 4021777. The next prime is 4021867. The reversal of 4021818 is 8181204.

It is a sphenic number, since it is the product of 3 distinct primes.

4021818 is an admirable number.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

4021818 is a modest number, since divided by 1818 gives 402 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335146 + ... + 335157.

It is an arithmetic number, because the mean of its divisors is an integer number (1005456).

Almost surely, 2^4021818 is an apocalyptic number.

4021818 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4021818 is a wasteful number, since it uses less digits than its factorization.

4021818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670308.

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 4021818 is about 2005.4470823235. The cubic root of 4021818 is about 159.0281979972.

The spelling of 4021818 in words is "four million, twenty-one thousand, eight hundred eighteen".