11685640 has 16 divisors (see below), whose sum is σ = 26292780. Its totient is φ = 4674240.

The previous prime is 11685617. The next prime is 11685643. The reversal of 11685640 is 4658611.

11685640 = 90² + 91² + ... + 329².

It can be written as a sum of positive squares in 2 ways, for example, as 11682724 + 2916 = 3418^2 + 54^2 .

It is not an unprimeable number, because it can be changed into a prime (11685643) 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, 146031 + ... + 146110.

Almost surely, 2^11685640 is an apocalyptic number.

11685640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11685640 is an abundant number, since it is smaller than the sum of its proper divisors (14607140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11685640 is a wasteful number, since it uses less digits than its factorization.

11685640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292152 (or 292148 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 11685640 is about 3418.4265386286. The cubic root of 11685640 is about 226.9259528065.

The spelling of 11685640 in words is "eleven million, six hundred eighty-five thousand, six hundred forty".