798855138 has 24 divisors (see below), whose sum is σ = 1736502768. Its totient is φ = 265415832.

The previous prime is 798855077. The next prime is 798855149. The reversal of 798855138 is 831558897.

798855138 is a `hidden beast` number, since 7 + 9 + 88 + 551 + 3 + 8 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66756 + ... + 77807.

It is an arithmetic number, because the mean of its divisors is an integer number (72354282).

Almost surely, 2^798855138 is an apocalyptic number.

798855138 is an abundant number, since it is smaller than the sum of its proper divisors (937647630).

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

798855138 is a wasteful number, since it uses less digits than its factorization.

798855138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144878 (or 144875 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 54.

The square root of 798855138 is about 28264.0255094705. The cubic root of 798855138 is about 927.8747237561.

The spelling of 798855138 in words is "seven hundred ninety-eight million, eight hundred fifty-five thousand, one hundred thirty-eight".