859639890 has 16 divisors (see below), whose sum is σ = 2063135808. Its totient is φ = 229237296.

The previous prime is 859639831. The next prime is 859639909. The reversal of 859639890 is 98936958.

It is a self number, because there is not a number n which added to its sum of digits gives 859639890.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 14327302 + ... + 14327361.

It is an arithmetic number, because the mean of its divisors is an integer number (128945988).

Almost surely, 2^859639890 is an apocalyptic number.

859639890 is an abundant number, since it is smaller than the sum of its proper divisors (1203495918).

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

859639890 is a wasteful number, since it uses less digits than its factorization.

859639890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28654673.

The product of its (nonzero) digits is 4199040, while the sum is 57.

The square root of 859639890 is about 29319.6161298200. The cubic root of 859639890 is about 950.8357889448.

The spelling of 859639890 in words is "eight hundred fifty-nine million, six hundred thirty-nine thousand, eight hundred ninety".