1990533 has 8 divisors (see below), whose sum is σ = 2661088. Its totient is φ = 1323504.

The previous prime is 1990529. The next prime is 1990543. The reversal of 1990533 is 3350991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1990533 - 2² = 1990529 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1990533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990523) 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, 1035 + ... + 2247.

It is an arithmetic number, because the mean of its divisors is an integer number (332636).

2^1990533 is an apocalyptic number.

It is an amenable number.

1990533 is a deficient number, since it is larger than the sum of its proper divisors (670555).

1990533 is a wasteful number, since it uses less digits than its factorization.

1990533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1763.

The product of its (nonzero) digits is 3645, while the sum is 30.

The square root of 1990533 is about 1410.8625021596. The cubic root of 1990533 is about 125.7929959544.

The spelling of 1990533 in words is "one million, nine hundred ninety thousand, five hundred thirty-three".