12040 has 32 divisors (see below), whose sum is σ = 31680. Its totient is φ = 4032.

The previous prime is 12037. The next prime is 12041. The reversal of 12040 is 4021.

12040 = 21² + 22² + ... + 35².

It is a Harshad number since it is a multiple of its sum of digits (7).

It is not an unprimeable number, because it can be changed into a prime (12041) 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, 259 + ... + 301.

It is an arithmetic number, because the mean of its divisors is an integer number (990).

2¹²⁰⁴⁰ is an apocalyptic number.

12040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15840).

12040 is an abundant number, since it is smaller than the sum of its proper divisors (19640).

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

12040 is a wasteful number, since it uses less digits than its factorization.

12040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 12040 is about 109.7269337948. The cubic root of 12040 is about 22.9196947330.

Adding to 12040 its reverse (4021), we get a palindrome (16061).

The spelling of 12040 in words is "twelve thousand, forty", and thus it is an iban number.