11851857 has 6 divisors (see below), whose sum is σ = 17119362. Its totient is φ = 7901232.

The previous prime is 11851841. The next prime is 11851859. The reversal of 11851857 is 75815811.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 9492561 + 2359296 = 3081^2 + 1536^2 .

It is not a de Polignac number, because 11851857 - 2⁴ = 11851841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11851859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 658428 + ... + 658445.

It is an arithmetic number, because the mean of its divisors is an integer number (2853227).

Almost surely, 2^11851857 is an apocalyptic number.

It is an amenable number.

11851857 is a deficient number, since it is larger than the sum of its proper divisors (5267505).

11851857 is a wasteful number, since it uses less digits than its factorization.

11851857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316879 (or 1316876 counting only the distinct ones).

The product of its digits is 11200, while the sum is 36.

The square root of 11851857 is about 3442.6526109964. The cubic root of 11851857 is about 227.9968259023.

The spelling of 11851857 in words is "eleven million, eight hundred fifty-one thousand, eight hundred fifty-seven".