858778459 has 12 divisors (see below), whose sum is σ = 1089804888. Its totient is φ = 669177600.

The previous prime is 858778447. The next prime is 858778483. The reversal of 858778459 is 954877858.

It is not a de Polignac number, because 858778459 - 2¹³ = 858770267 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 858778397 and 858778406.

It is not an unprimeable number, because it can be changed into a prime (858778429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 796102 + ... + 797179.

It is an arithmetic number, because the mean of its divisors is an integer number (90817074).

Almost surely, 2^858778459 is an apocalyptic number.

858778459 is a deficient number, since it is larger than the sum of its proper divisors (231026429).

858778459 is a wasteful number, since it uses less digits than its factorization.

858778459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1593306 (or 1593299 counting only the distinct ones).

The product of its digits is 22579200, while the sum is 61.

The square root of 858778459 is about 29304.9220951020. The cubic root of 858778459 is about 950.5180771596.

The spelling of 858778459 in words is "eight hundred fifty-eight million, seven hundred seventy-eight thousand, four hundred fifty-nine".