12406840 has 64 divisors (see below), whose sum is σ = 29302560. Its totient is φ = 4723200.

The previous prime is 12406837. The next prime is 12406841. The reversal of 12406840 is 4860421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12406841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122790 + ... + 122890.

Almost surely, 2^12406840 is an apocalyptic number.

12406840 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 12406840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14651280).

12406840 is an abundant number, since it is smaller than the sum of its proper divisors (16895720).

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

12406840 is a wasteful number, since it uses less digits than its factorization.

12406840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 12406840 is about 3522.3344531716. The cubic root of 12406840 is about 231.5014562026.

The spelling of 12406840 in words is "twelve million, four hundred six thousand, eight hundred forty".