11787681 has 8 divisors (see below), whose sum is σ = 16641504. Its totient is φ = 7396160.

The previous prime is 11787679. The next prime is 11787689. The reversal of 11787681 is 18678711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11787681 - 2¹ = 11787679 is a prime.

It is a super-2 number, since 2×11787681² = 277898846715522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11787689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115515 + ... + 115616.

It is an arithmetic number, because the mean of its divisors is an integer number (2080188).

Almost surely, 2^11787681 is an apocalyptic number.

It is an amenable number.

11787681 is a deficient number, since it is larger than the sum of its proper divisors (4853823).

11787681 is a wasteful number, since it uses less digits than its factorization.

11787681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231151.

The product of its digits is 18816, while the sum is 39.

The square root of 11787681 is about 3433.3192394533. The cubic root of 11787681 is about 227.5845581900.

The spelling of 11787681 in words is "eleven million, seven hundred eighty-seven thousand, six hundred eighty-one".