11309857 has 4 divisors (see below), whose sum is σ = 12179860. Its totient is φ = 10439856.

The previous prime is 11309849. The next prime is 11309863. The reversal of 11309857 is 75890311.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2405601 + 8904256 = 1551^2 + 2984^2 .

It is a cyclic number.

It is not a de Polignac number, because 11309857 - 2³ = 11309849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11309897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 434982 + ... + 435007.

It is an arithmetic number, because the mean of its divisors is an integer number (3044965).

Almost surely, 2^11309857 is an apocalyptic number.

It is an amenable number.

11309857 is a deficient number, since it is larger than the sum of its proper divisors (870003).

11309857 is an equidigital number, since it uses as much as digits as its factorization.

11309857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870002.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 11309857 is about 3363.0130835309. The cubic root of 11309857 is about 224.4669322975.

The spelling of 11309857 in words is "eleven million, three hundred nine thousand, eight hundred fifty-seven".