856420336 has 20 divisors (see below), whose sum is σ = 1697904472. Its totient is φ = 418251456.

The previous prime is 856420289. The next prime is 856420337. The reversal of 856420336 is 633024658.

It is a junction number, because it is equal to n+sod(n) for n = 856420295 and 856420304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856420337) 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, 621711 + ... + 623086.

Almost surely, 2^856420336 is an apocalyptic number.

856420336 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

It is an amenable number.

856420336 is a deficient number, since it is larger than the sum of its proper divisors (841484136).

856420336 is a wasteful number, since it uses less digits than its factorization.

856420336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244848 (or 1244842 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 856420336 is about 29264.6601893820. The cubic root of 856420336 is about 949.6472692335.

It can be divided in two parts, 8564 and 20336, that added together give a square (28900 = 170²).

The spelling of 856420336 in words is "eight hundred fifty-six million, four hundred twenty thousand, three hundred thirty-six".