4020989 has 16 divisors (see below), whose sum is σ = 4944000. Its totient is φ = 3259872.

The previous prime is 4020977. The next prime is 4021001. The reversal of 4020989 is 9890204.

It is an interprime number because it is at equal distance from previous prime (4020977) and next prime (4021001).

It is not a de Polignac number, because 4020989 - 2⁸ = 4020733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4020949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6209 + ... + 6825.

It is an arithmetic number, because the mean of its divisors is an integer number (309000).

Almost surely, 2^4020989 is an apocalyptic number.

4020989 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

4020989 is a deficient number, since it is larger than the sum of its proper divisors (923011).

4020989 is an equidigital number, since it uses as much as digits as its factorization.

4020989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657 (or 643 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 4020989 is about 2005.2403845923. The cubic root of 4020989 is about 159.0172706475.

The spelling of 4020989 in words is "four million, twenty thousand, nine hundred eighty-nine".