1990530 has 48 divisors (see below), whose sum is σ = 5484024. Its totient is φ = 499200.

The previous prime is 1990529. The next prime is 1990543. The reversal of 1990530 is 350991.

It can be written as a sum of positive squares in 4 ways, for example, as 1185921 + 804609 = 1089^2 + 897^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1990494 and 1990503.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 880 + ... + 2180.

2^1990530 is an apocalyptic number.

1990530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1990530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2742012).

1990530 is an abundant number, since it is smaller than the sum of its proper divisors (3493494).

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

1990530 is a wasteful number, since it uses less digits than its factorization.

1990530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331 (or 1328 counting only the distinct ones).

The product of its (nonzero) digits is 1215, while the sum is 27.

The square root of 1990530 is about 1410.8614389797. The cubic root of 1990530 is about 125.7929327587.

The spelling of 1990530 in words is "one million, nine hundred ninety thousand, five hundred thirty".