856087405 has 4 divisors (see below), whose sum is σ = 1027304892. Its totient is φ = 684869920.

The previous prime is 856087373. The next prime is 856087409. The reversal of 856087405 is 504780658.

856087405 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 684031716 + 172055689 = 26154^2 + 13117^2 .

It is not a de Polignac number, because 856087405 - 2⁵ = 856087373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856087409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85608736 + ... + 85608745.

It is an arithmetic number, because the mean of its divisors is an integer number (256826223).

Almost surely, 2^856087405 is an apocalyptic number.

It is an amenable number.

856087405 is a deficient number, since it is larger than the sum of its proper divisors (171217487).

856087405 is a wasteful number, since it uses less digits than its factorization.

856087405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171217486.

The product of its (nonzero) digits is 268800, while the sum is 43.

The square root of 856087405 is about 29258.9713592259. The cubic root of 856087405 is about 949.5241957145.

The spelling of 856087405 in words is "eight hundred fifty-six million, eighty-seven thousand, four hundred five".