1980684 has 36 divisors (see below), whose sum is σ = 5145504. Its totient is φ = 641952.

The previous prime is 1980673. The next prime is 1980697. The reversal of 1980684 is 4860891.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 589 + ... + 2075.

2^1980684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1980684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2572752).

1980684 is an abundant number, since it is smaller than the sum of its proper divisors (3164820).

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

1980684 is a wasteful number, since it uses less digits than its factorization.

1980684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534 (or 1529 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1980684 is about 1407.3677557767. The cubic root of 1980684 is about 125.5851815587.

The spelling of 1980684 in words is "one million, nine hundred eighty thousand, six hundred eighty-four".