11990857 has 4 divisors (see below), whose sum is σ = 12142720. Its totient is φ = 11838996.

The previous prime is 11990837. The next prime is 11990861. The reversal of 11990857 is 75809911.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75809911 = 31 ⋅2445481.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11990857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11990827) 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, 75813 + ... + 75970.

It is an arithmetic number, because the mean of its divisors is an integer number (3035680).

Almost surely, 2^11990857 is an apocalyptic number.

It is an amenable number.

11990857 is a deficient number, since it is larger than the sum of its proper divisors (151863).

11990857 is an equidigital number, since it uses as much as digits as its factorization.

11990857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151862.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 11990857 is about 3462.7816852929. The cubic root of 11990857 is about 228.8846886132.

The spelling of 11990857 in words is "eleven million, nine hundred ninety thousand, eight hundred fifty-seven".