1990799 has 4 divisors (see below), whose sum is σ = 1998264. Its totient is φ = 1983336.

The previous prime is 1990787. The next prime is 1990823. The reversal of 1990799 is 9970991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9970991 = 19 ⋅524789.

It is a cyclic number.

It is not a de Polignac number, because 1990799 - 2⁸ = 1990543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990759) 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, 3317 + ... + 3870.

It is an arithmetic number, because the mean of its divisors is an integer number (499566).

2^1990799 is an apocalyptic number.

1990799 is a deficient number, since it is larger than the sum of its proper divisors (7465).

1990799 is an equidigital number, since it uses as much as digits as its factorization.

1990799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7464.

The product of its (nonzero) digits is 45927, while the sum is 44.

The square root of 1990799 is about 1410.9567675872. The cubic root of 1990799 is about 125.7985990511.

The spelling of 1990799 in words is "one million, nine hundred ninety thousand, seven hundred ninety-nine".