1990328 has 32 divisors (see below), whose sum is σ = 4039200. Its totient is φ = 916608.

The previous prime is 1990327. The next prime is 1990337. The reversal of 1990328 is 8230991.

It is a super-2 number, since 2×1990328² = 7922811095168, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1990294 and 1990303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5150 + ... + 5522.

It is an arithmetic number, because the mean of its divisors is an integer number (126225).

2^1990328 is an apocalyptic number.

It is an amenable number.

1990328 is an abundant number, since it is smaller than the sum of its proper divisors (2048872).

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

1990328 is a wasteful number, since it uses less digits than its factorization.

1990328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 1990328 is about 1410.7898496941. The cubic root of 1990328 is about 125.7886774378.

The spelling of 1990328 in words is "one million, nine hundred ninety thousand, three hundred twenty-eight".