11887657 has 4 divisors (see below), whose sum is σ = 11910996. Its totient is φ = 11864320.

The previous prime is 11887643. The next prime is 11887669. The reversal of 11887657 is 75678811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75678811 = 13 ⋅5821447.

It can be written as a sum of positive squares in 2 ways, for example, as 8856576 + 3031081 = 2976^2 + 1741^2 .

It is a cyclic number.

It is not a de Polignac number, because 11887657 - 2¹⁹ = 11363369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11887637) 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 3 ways as a sum of consecutive naturals, for example, 10888 + ... + 11929.

It is an arithmetic number, because the mean of its divisors is an integer number (2977749).

Almost surely, 2^11887657 is an apocalyptic number.

It is an amenable number.

11887657 is a deficient number, since it is larger than the sum of its proper divisors (23339).

11887657 is an equidigital number, since it uses as much as digits as its factorization.

11887657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23338.

The product of its digits is 94080, while the sum is 43.

The square root of 11887657 is about 3447.8481695109. The cubic root of 11887657 is about 228.2261593514.

It can be divided in two parts, 11887 and 657, that added together give a square (12544 = 112²).

The spelling of 11887657 in words is "eleven million, eight hundred eighty-seven thousand, six hundred fifty-seven".