11828781 has 16 divisors (see below), whose sum is σ = 18129600. Its totient is φ = 7613424.

The previous prime is 11828779. The next prime is 11828797. The reversal of 11828781 is 18782811.

11828781 is nontrivially palindromic in base 2 and base 8.

It is not a de Polignac number, because 11828781 - 2¹ = 11828779 is a prime.

It is a super-2 number, since 2×11828781² = 279840119891922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11828771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6771 + ... + 8336.

It is an arithmetic number, because the mean of its divisors is an integer number (1133100).

Almost surely, 2^11828781 is an apocalyptic number.

It is an amenable number.

11828781 is a deficient number, since it is larger than the sum of its proper divisors (6300819).

11828781 is a wasteful number, since it uses less digits than its factorization.

11828781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15145 (or 15139 counting only the distinct ones).

The product of its digits is 7168, while the sum is 36.

The square root of 11828781 is about 3439.2994926293. The cubic root of 11828781 is about 227.8487570364.

The spelling of 11828781 in words is "eleven million, eight hundred twenty-eight thousand, seven hundred eighty-one".