3988820 has 24 divisors (see below), whose sum is σ = 9138528. Its totient is φ = 1450400.

The previous prime is 3988783. The next prime is 3988823. The reversal of 3988820 is 288893.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3988823) 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 7 ways as a sum of consecutive naturals, for example, 8846 + ... + 9285.

It is an arithmetic number, because the mean of its divisors is an integer number (380772).

Almost surely, 2^3988820 is an apocalyptic number.

It is an amenable number.

3988820 is an abundant number, since it is smaller than the sum of its proper divisors (5149708).

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

3988820 is a wasteful number, since it uses less digits than its factorization.

3988820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18151 (or 18149 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 3988820 is about 1997.2030442596. The cubic root of 3988820 is about 158.5920743309.

The spelling of 3988820 in words is "three million, nine hundred eighty-eight thousand, eight hundred twenty".