856400499 has 16 divisors (see below), whose sum is σ = 1287680640. Its totient is φ = 562411080.

The previous prime is 856400491. The next prime is 856400507. The reversal of 856400499 is 994004658.

It is a happy number.

856400499 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (856400491) and next prime (856400507).

It is not a de Polignac number, because 856400499 - 2³ = 856400491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (856400491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234897 + ... + 238514.

It is an arithmetic number, because the mean of its divisors is an integer number (80480040).

Almost surely, 2^856400499 is an apocalyptic number.

856400499 is a deficient number, since it is larger than the sum of its proper divisors (431280141).

856400499 is a wasteful number, since it uses less digits than its factorization.

856400499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473487 (or 473481 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 856400499 is about 29264.3212632721. The cubic root of 856400499 is about 949.6399370480.

The spelling of 856400499 in words is "eight hundred fifty-six million, four hundred thousand, four hundred ninety-nine".