1980000 has 180 divisors, whose sum is σ = 7675668. Its totient is φ = 480000.

The previous prime is 1979993. The next prime is 1980019. The reversal of 1980000 is 891.

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a zygodrome in base 7.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 179995 + ... + 180005.

2^1980000 is an apocalyptic number.

1980000 is a gapful number since it is divisible by the number (10) 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 1980000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3837834).

1980000 is an abundant number, since it is smaller than the sum of its proper divisors (5695668).

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

1980000 is a wasteful number, since it uses less digits than its factorization.

1980000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47 (or 21 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1980000 is about 1407.1247279470. The cubic root of 1980000 is about 125.5707235644.

Adding to 1980000 its reverse (891), we get a palindrome (1980891).

The spelling of 1980000 in words is "one million, nine hundred eighty thousand".