799990 has 8 divisors (see below), whose sum is σ = 1440000. Its totient is φ = 319992.

The previous prime is 799979. The next prime is 799991. The reversal of 799990 is 99997.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (799991) by changing a digit.

799990 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 39990 + ... + 40009.

It is an arithmetic number, because the mean of its divisors is an integer number (180000).

2⁷⁹⁹⁹⁹⁰ is an apocalyptic number.

799990 is a deficient number, since it is larger than the sum of its proper divisors (640010).

799990 is a wasteful number, since it uses less digits than its factorization.

799990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80006.

The product of its (nonzero) digits is 45927, while the sum is 43.

The square root of 799990 is about 894.4216008125. The cubic root of 799990 is about 92.8313898716.

The spelling of 799990 in words is "seven hundred ninety-nine thousand, nine hundred ninety".