12400540 has 24 divisors (see below), whose sum is σ = 27412560. Its totient is φ = 4699008.

The previous prime is 12400517. The next prime is 12400541. The reversal of 12400540 is 4500421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12400541) 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, 15937 + ... + 16696.

It is an arithmetic number, because the mean of its divisors is an integer number (1142190).

Almost surely, 2^12400540 is an apocalyptic number.

12400540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12400540 is an abundant number, since it is smaller than the sum of its proper divisors (15012020).

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

12400540 is a wasteful number, since it uses less digits than its factorization.

12400540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32661 (or 32659 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 12400540 is about 3521.4400463447. The cubic root of 12400540 is about 231.4622652912.

Adding to 12400540 its reverse (4500421), we get a palindrome (16900961).

The spelling of 12400540 in words is "twelve million, four hundred thousand, five hundred forty".