12405240 has 96 divisors (see below), whose sum is σ = 42709680. Its totient is φ = 3111936.

The previous prime is 12405221. The next prime is 12405269. The reversal of 12405240 is 4250421.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5107 + ... + 7133.

Almost surely, 2^12405240 is an apocalyptic number.

12405240 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 12405240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21354840).

12405240 is an abundant number, since it is smaller than the sum of its proper divisors (30304440).

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

12405240 is a wasteful number, since it uses less digits than its factorization.

12405240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061 (or 2054 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 12405240 is about 3522.1073237481. The cubic root of 12405240 is about 231.4915042123.

Adding to 12405240 its reverse (4250421), we get a palindrome (16655661).

The spelling of 12405240 in words is "twelve million, four hundred five thousand, two hundred forty".