1990816 has 12 divisors (see below), whose sum is σ = 3919482. Its totient is φ = 995392.

The previous prime is 1990787. The next prime is 1990823. The reversal of 1990816 is 6180991.

It can be written as a sum of positive squares in only one way, i.e., 1971216 + 19600 = 1404^2 + 140^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31075 + ... + 31138.

2^1990816 is an apocalyptic number.

1990816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1990816 is a deficient number, since it is larger than the sum of its proper divisors (1928666).

1990816 is an equidigital number, since it uses as much as digits as its factorization.

1990816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62223 (or 62215 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1990816 is about 1410.9627918553. The cubic root of 1990816 is about 125.7989571267.

The spelling of 1990816 in words is "one million, nine hundred ninety thousand, eight hundred sixteen".