1990333 has 4 divisors (see below), whose sum is σ = 1993180. Its totient is φ = 1987488.

The previous prime is 1990327. The next prime is 1990337. The reversal of 1990333 is 3330991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3330991 = 683 ⋅4877.

It can be written as a sum of positive squares in 2 ways, for example, as 1776889 + 213444 = 1333^2 + 462^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1990333 is a prime.

It is a super-2 number, since 2×1990333² = 7922850901778, which contains 22 as substring.

It is a Duffinian number.

1990333 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 433 + ... + 2041.

It is an arithmetic number, because the mean of its divisors is an integer number (498295).

2^1990333 is an apocalyptic number.

It is an amenable number.

1990333 is a deficient number, since it is larger than the sum of its proper divisors (2847).

1990333 is a wasteful number, since it uses less digits than its factorization.

1990333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2846.

The product of its (nonzero) digits is 2187, while the sum is 28.

The square root of 1990333 is about 1410.7916217500. The cubic root of 1990333 is about 125.7887827710.

The spelling of 1990333 in words is "one million, nine hundred ninety thousand, three hundred thirty-three".