12013840 has 40 divisors (see below), whose sum is σ = 28087488. Its totient is φ = 4778880.

The previous prime is 12013787. The next prime is 12013847. The reversal of 12013840 is 4831021.

It is a tau number, because it is divible by the number of its divisors (40).

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (12013847) 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, 20755 + ... + 21325.

Almost surely, 2^12013840 is an apocalyptic number.

12013840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12013840 is an abundant number, since it is smaller than the sum of its proper divisors (16073648).

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

12013840 is a wasteful number, since it uses less digits than its factorization.

12013840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847 (or 841 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 12013840 is about 3466.0986714172. The cubic root of 12013840 is about 229.0308305013.

Adding to 12013840 its reverse (4831021), we get a palindrome (16844861).

It can be divided in two parts, 1201 and 3840, that added together give a square (5041 = 71²).

The spelling of 12013840 in words is "twelve million, thirteen thousand, eight hundred forty".