11640857 has 2 divisors, whose sum is σ = 11640858. Its totient is φ = 11640856.

The previous prime is 11640847. The next prime is 11640883. The reversal of 11640857 is 75804611.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5900041 + 5740816 = 2429^2 + 2396^2 .

It is an emirp because it is prime and its reverse (75804611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11640857 - 2⁶ = 11640793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11640817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5820428 + 5820429.

It is an arithmetic number, because the mean of its divisors is an integer number (5820429).

Almost surely, 2^11640857 is an apocalyptic number.

It is an amenable number.

11640857 is a deficient number, since it is larger than the sum of its proper divisors (1).

11640857 is an equidigital number, since it uses as much as digits as its factorization.

11640857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 11640857 is about 3411.8700151090. The cubic root of 11640857 is about 226.6356981432.

The spelling of 11640857 in words is "eleven million, six hundred forty thousand, eight hundred fifty-seven".