1990065 has 32 divisors (see below), whose sum is σ = 3972096. Its totient is φ = 826560.

The previous prime is 1990039. The next prime is 1990069. The reversal of 1990065 is 5600991.

It is not a de Polignac number, because 1990065 - 2⁵ = 1990033 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1990069) 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 31 ways as a sum of consecutive naturals, for example, 294 + ... + 2016.

It is an arithmetic number, because the mean of its divisors is an integer number (124128).

2^1990065 is an apocalyptic number.

1990065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1990065 is a deficient number, since it is larger than the sum of its proper divisors (1982031).

1990065 is a wasteful number, since it uses less digits than its factorization.

1990065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1749.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 1990065 is about 1410.6966364176. The cubic root of 1990065 is about 125.7831366627.

The spelling of 1990065 in words is "one million, nine hundred ninety thousand, sixty-five".