1980198 has 48 divisors (see below), whose sum is σ = 4779216. Its totient is φ = 587520.

The previous prime is 1980191. The next prime is 1980221. The reversal of 1980198 is 8910891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14386 + ... + 14522.

It is an arithmetic number, because the mean of its divisors is an integer number (99567).

2^1980198 is an apocalyptic number.

1980198 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1980198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2389608).

1980198 is an abundant number, since it is smaller than the sum of its proper divisors (2799018).

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

1980198 is a wasteful number, since it uses less digits than its factorization.

1980198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 1980198 is about 1407.1950824246. The cubic root of 1980198 is about 125.5749091157.

The spelling of 1980198 in words is "one million, nine hundred eighty thousand, one hundred ninety-eight".