859988642 has 4 divisors (see below), whose sum is σ = 1289982966. Its totient is φ = 429994320.

The previous prime is 859988641. The next prime is 859988651. The reversal of 859988642 is 246889958.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 778465801 + 81522841 = 27901^2 + 9029^2 .

It is not an unprimeable number, because it can be changed into a prime (859988641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214997159 + ... + 214997162.

Almost surely, 2^859988642 is an apocalyptic number.

859988642 is a deficient number, since it is larger than the sum of its proper divisors (429994324).

859988642 is a wasteful number, since it uses less digits than its factorization.

859988642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429994323.

The product of its digits is 9953280, while the sum is 59.

The square root of 859988642 is about 29325.5629442983. The cubic root of 859988642 is about 950.9643548142.

The spelling of 859988642 in words is "eight hundred fifty-nine million, nine hundred eighty-eight thousand, six hundred forty-two".