856887459 has 4 divisors (see below), whose sum is σ = 1142516616. Its totient is φ = 571258304.

The previous prime is 856887457. The next prime is 856887463. The reversal of 856887459 is 954788658.

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

It is a cyclic number.

It is not a de Polignac number, because 856887459 - 2¹ = 856887457 is a prime.

It is a super-2 number, since 2×856887459² = 1468512234782953362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (856887457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142814574 + ... + 142814579.

It is an arithmetic number, because the mean of its divisors is an integer number (285629154).

Almost surely, 2^856887459 is an apocalyptic number.

856887459 is a deficient number, since it is larger than the sum of its proper divisors (285629157).

856887459 is a wasteful number, since it uses less digits than its factorization.

856887459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285629156.

The product of its digits is 19353600, while the sum is 60.

The square root of 856887459 is about 29272.6401098364. The cubic root of 856887459 is about 949.8198953124.

The spelling of 856887459 in words is "eight hundred fifty-six million, eight hundred eighty-seven thousand, four hundred fifty-nine".