3998220 has 48 divisors (see below), whose sum is σ = 11503968. Its totient is φ = 1036800.

The previous prime is 3998219. The next prime is 3998221. The reversal of 3998220 is 228993.

It is an interprime number because it is at equal distance from previous prime (3998219) and next prime (3998221).

It is not an unprimeable number, because it can be changed into a prime (3998221) 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, 1320 + ... + 3120.

It is an arithmetic number, because the mean of its divisors is an integer number (239666).

Almost surely, 2^3998220 is an apocalyptic number.

3998220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3998220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5751984).

3998220 is an abundant number, since it is smaller than the sum of its proper divisors (7505748).

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

3998220 is a wasteful number, since it uses less digits than its factorization.

3998220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1850 (or 1848 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 3998220 is about 1999.5549504827. The cubic root of 3998220 is about 158.7165552543.

The spelling of 3998220 in words is "three million, nine hundred ninety-eight thousand, two hundred twenty".