798639 has 16 divisors (see below), whose sum is σ = 1123584. Its totient is φ = 504000.

The previous prime is 798613. The next prime is 798641. The reversal of 798639 is 936897.

It is a happy number.

It is not a de Polignac number, because 798639 - 2⁸ = 798383 is a prime.

798639 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 798639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (798649) 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 15 ways as a sum of consecutive naturals, for example, 5214 + ... + 5364.

It is an arithmetic number, because the mean of its divisors is an integer number (70224).

2⁷⁹⁸⁶³⁹ is an apocalyptic number.

798639 is a deficient number, since it is larger than the sum of its proper divisors (324945).

798639 is a wasteful number, since it uses less digits than its factorization.

798639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238.

The product of its digits is 81648, while the sum is 42.

The square root of 798639 is about 893.6660450079. Note that the first 3 decimals coincide. The cubic root of 798639 is about 92.7791034375.

The spelling of 798639 in words is "seven hundred ninety-eight thousand, six hundred thirty-nine".