3985998 has 16 divisors (see below), whose sum is σ = 7991760. Its totient is φ = 1325376.

The previous prime is 3985951. The next prime is 3985999. The reversal of 3985998 is 8995893.

It is a self number, because there is not a number n which added to its sum of digits gives 3985998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3985999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3786 + ... + 4722.

It is an arithmetic number, because the mean of its divisors is an integer number (499485).

Almost surely, 2^3985998 is an apocalyptic number.

3985998 is an abundant number, since it is smaller than the sum of its proper divisors (4005762).

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

3985998 is a wasteful number, since it uses less digits than its factorization.

3985998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651.

The product of its digits is 699840, while the sum is 51.

The square root of 3985998 is about 1996.4964312515. The cubic root of 3985998 is about 158.5546654048.

The spelling of 3985998 in words is "three million, nine hundred eighty-five thousand, nine hundred ninety-eight".