11821636 has 12 divisors (see below), whose sum is σ = 20796412. Its totient is φ = 5879808.

The previous prime is 11821631. The next prime is 11821643. The reversal of 11821636 is 63612811.

It can be written as a sum of positive squares in 2 ways, for example, as 799236 + 11022400 = 894^2 + 3320^2 .

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (11821631) 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, 6885 + ... + 8428.

Almost surely, 2^11821636 is an apocalyptic number.

It is an amenable number.

11821636 is a deficient number, since it is larger than the sum of its proper divisors (8974776).

11821636 is a wasteful number, since it uses less digits than its factorization.

11821636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15510 (or 15508 counting only the distinct ones).

The product of its digits is 1728, while the sum is 28.

The square root of 11821636 is about 3438.2606067603. The cubic root of 11821636 is about 227.8028715738.

The spelling of 11821636 in words is "eleven million, eight hundred twenty-one thousand, six hundred thirty-six".