3998000 has 40 divisors (see below), whose sum is σ = 9672000. Its totient is φ = 1598400.

The previous prime is 3997997. The next prime is 3998003. The reversal of 3998000 is 8993.

It is an interprime number because it is at equal distance from previous prime (3997997) and next prime (3998003).

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (3998003) 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, 1001 + ... + 2999.

It is an arithmetic number, because the mean of its divisors is an integer number (241800).

Almost surely, 2^3998000 is an apocalyptic number.

It is a pronic number, being equal to 1999×2000.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3998000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4836000).

3998000 is an abundant number, since it is smaller than the sum of its proper divisors (5674000).

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

3998000 is a wasteful number, since it uses less digits than its factorization.

3998000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2022 (or 2006 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 3998000 is about 1999.4999374844. The cubic root of 3998000 is about 158.7136441019.

The spelling of 3998000 in words is "three million, nine hundred ninety-eight thousand".