10209856 has 28 divisors (see below), whose sum is σ = 20962620. Its totient is φ = 4928000.

The previous prime is 10209803. The next prime is 10209863. The reversal of 10209856 is 65890201.

It can be written as a sum of positive squares in 2 ways, for example, as 8294400 + 1915456 = 2880^2 + 1384^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 895 + ... + 4606.

It is an arithmetic number, because the mean of its divisors is an integer number (748665).

Almost surely, 2^10209856 is an apocalyptic number.

10209856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

10209856 is an abundant number, since it is smaller than the sum of its proper divisors (10752764).

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

10209856 is an equidigital number, since it uses as much as digits as its factorization.

10209856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5542 (or 5532 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 10209856 is about 3195.2865286231. The cubic root of 10209856 is about 216.9401181156.

The spelling of 10209856 in words is "ten million, two hundred nine thousand, eight hundred fifty-six".