11986840 has 16 divisors (see below), whose sum is σ = 26970480. Its totient is φ = 4794720.

The previous prime is 11986837. The next prime is 11986847. The reversal of 11986840 is 4868911.

It is a happy number.

It is a super-3 number, since 3×11986840³ (a number of 22 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11986840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11986847) 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, 149796 + ... + 149875.

It is an arithmetic number, because the mean of its divisors is an integer number (1685655).

Almost surely, 2^11986840 is an apocalyptic number.

11986840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11986840 is an abundant number, since it is smaller than the sum of its proper divisors (14983640).

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

11986840 is a wasteful number, since it uses less digits than its factorization.

11986840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299682 (or 299678 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 11986840 is about 3462.2016116916. The cubic root of 11986840 is about 228.8591265680.

The spelling of 11986840 in words is "eleven million, nine hundred eighty-six thousand, eight hundred forty".