11855857 has 18 divisors (see below), whose sum is σ = 13447206. Its totient is φ = 10445760.

The previous prime is 11855839. The next prime is 11855869. The reversal of 11855857 is 75855811.

It can be written as a sum of positive squares in 3 ways, for example, as 15376 + 11840481 = 124^2 + 3441^2 .

It is not a de Polignac number, because 11855857 - 2¹⁵ = 11823089 is a prime.

It is a super-2 number, since 2×11855857² = 281122690408898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11855827) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 162373 + ... + 162445.

It is an arithmetic number, because the mean of its divisors is an integer number (747067).

Almost surely, 2^11855857 is an apocalyptic number.

It is an amenable number.

11855857 is a deficient number, since it is larger than the sum of its proper divisors (1591349).

11855857 is an equidigital number, since it uses as much as digits as its factorization.

11855857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 117 counting only the distinct ones).

The product of its digits is 56000, while the sum is 40.

The square root of 11855857 is about 3443.2335093630. The cubic root of 11855857 is about 228.0224726490.

The spelling of 11855857 in words is "eleven million, eight hundred fifty-five thousand, eight hundred fifty-seven".