4021686 has 24 divisors (see below), whose sum is σ = 8751600. Its totient is φ = 1334736.

The previous prime is 4021663. The next prime is 4021727. The reversal of 4021686 is 6861204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6415 + ... + 7013.

It is an arithmetic number, because the mean of its divisors is an integer number (364650).

Almost surely, 2^4021686 is an apocalyptic number.

4021686 is an abundant number, since it is smaller than the sum of its proper divisors (4729914).

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

4021686 is a wasteful number, since it uses less digits than its factorization.

4021686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980 (or 977 counting only the distinct ones).

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

The square root of 4021686 is about 2005.4141716862. The cubic root of 4021686 is about 159.0264581578.

The spelling of 4021686 in words is "four million, twenty-one thousand, six hundred eighty-six".