4021668 has 36 divisors (see below), whose sum is σ = 11618880. Its totient is φ = 1148976.

The previous prime is 4021663. The next prime is 4021727. The reversal of 4021668 is 8661204.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (4021663) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 7728 + ... + 8231.

Almost surely, 2^4021668 is an apocalyptic number.

It is an amenable number.

4021668 is an abundant number, since it is smaller than the sum of its proper divisors (7597212).

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

4021668 is a wasteful number, since it uses less digits than its factorization.

4021668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15976 (or 15971 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 4021668 is about 2005.4096838302. The cubic root of 4021668 is about 159.0262209041.

The spelling of 4021668 in words is "four million, twenty-one thousand, six hundred sixty-eight".