799890 has 64 divisors (see below), whose sum is σ = 2370816. Its totient is φ = 168192.

The previous prime is 799873. The next prime is 799891. The reversal of 799890 is 98997.

799890 = 45² + 46² + ... + 135².

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (799891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2584 + ... + 2876.

It is an arithmetic number, because the mean of its divisors is an integer number (37044).

2⁷⁹⁹⁸⁹⁰ is an apocalyptic number.

799890 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 799890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1185408).

799890 is an abundant number, since it is smaller than the sum of its proper divisors (1570926).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

799890 is a wasteful number, since it uses less digits than its factorization.

799890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323.

The product of its (nonzero) digits is 40824, while the sum is 42.

The square root of 799890 is about 894.3656970166. The cubic root of 799890 is about 92.8275216875.

The spelling of 799890 in words is "seven hundred ninety-nine thousand, eight hundred ninety".