1980540 has 36 divisors (see below), whose sum is σ = 6008184. Its totient is φ = 528096.

The previous prime is 1980529. The next prime is 1980577. The reversal of 1980540 is 450891.

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

It is a zygodrome in base 2.

It is a congruent number.

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, 5322 + ... + 5681.

It is an arithmetic number, because the mean of its divisors is an integer number (166894).

2^1980540 is an apocalyptic number.

1980540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1980540 is an abundant number, since it is smaller than the sum of its proper divisors (4027644).

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

1980540 is a wasteful number, since it uses less digits than its factorization.

1980540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11018 (or 11013 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1980540 is about 1407.3165955108. The cubic root of 1980540 is about 125.5821380471.

The spelling of 1980540 in words is "one million, nine hundred eighty thousand, five hundred forty".