11857649 has 4 divisors (see below), whose sum is σ = 12178164. Its totient is φ = 11537136.

The previous prime is 11857613. The next prime is 11857661. The reversal of 11857649 is 94675811.

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 11458225 + 399424 = 3385^2 + 632^2 .

It is a cyclic number.

It is not a de Polignac number, because 11857649 - 2⁸ = 11857393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11857049) 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, 160202 + ... + 160275.

It is an arithmetic number, because the mean of its divisors is an integer number (3044541).

Almost surely, 2^11857649 is an apocalyptic number.

It is an amenable number.

11857649 is a deficient number, since it is larger than the sum of its proper divisors (320515).

11857649 is an equidigital number, since it uses as much as digits as its factorization.

11857649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320514.

The product of its digits is 60480, while the sum is 41.

The square root of 11857649 is about 3443.4937200465. The cubic root of 11857649 is about 228.0339605205.

The spelling of 11857649 in words is "eleven million, eight hundred fifty-seven thousand, six hundred forty-nine".