4021988 has 12 divisors (see below), whose sum is σ = 7056000. Its totient is φ = 2005992.

The previous prime is 4021973. The next prime is 4022003. The reversal of 4021988 is 8891204.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (4021973) and next prime (4022003).

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, 1013 + ... + 3011.

It is an arithmetic number, because the mean of its divisors is an integer number (588000).

Almost surely, 2^4021988 is an apocalyptic number.

It is an amenable number.

4021988 is a deficient number, since it is larger than the sum of its proper divisors (3034012).

4021988 is a wasteful number, since it uses less digits than its factorization.

4021988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2506 (or 2504 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 4021988 is about 2005.4894664396. The cubic root of 4021988 is about 159.0304386433.

The spelling of 4021988 in words is "four million, twenty-one thousand, nine hundred eighty-eight".