856421850 has 24 divisors (see below), whose sum is σ = 2123926560. Its totient is φ = 228379120.

The previous prime is 856421849. The next prime is 856421851. The reversal of 856421850 is 58124658.

It is an interprime number because it is at equal distance from previous prime (856421849) and next prime (856421851).

It is a junction number, because it is equal to n+sod(n) for n = 856421799 and 856421808.

It is not an unprimeable number, because it can be changed into a prime (856421851) 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, 2854590 + ... + 2854889.

It is an arithmetic number, because the mean of its divisors is an integer number (88496940).

Almost surely, 2^856421850 is an apocalyptic number.

856421850 is an abundant number, since it is smaller than the sum of its proper divisors (1267504710).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

856421850 is a wasteful number, since it uses less digits than its factorization.

856421850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5709494 (or 5709489 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 39.

The square root of 856421850 is about 29264.6860567476. The cubic root of 856421850 is about 949.6478288361.

The spelling of 856421850 in words is "eight hundred fifty-six million, four hundred twenty-one thousand, eight hundred fifty".