1990216 has 16 divisors (see below), whose sum is σ = 3753900. Its totient is φ = 989184.

The previous prime is 1990211. The next prime is 1990223. The reversal of 1990216 is 6120991.

It can be written as a sum of positive squares in 2 ways, for example, as 1988100 + 2116 = 1410^2 + 46^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 900 + ... + 2188.

2^1990216 is an apocalyptic number.

It is an amenable number.

1990216 is a deficient number, since it is larger than the sum of its proper divisors (1763684).

1990216 is a wasteful number, since it uses less digits than its factorization.

1990216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488 (or 1484 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 1990216 is about 1410.7501550594. The cubic root of 1990216 is about 125.7863179278.

The spelling of 1990216 in words is "one million, nine hundred ninety thousand, two hundred sixteen".