12400740 has 72 divisors (see below), whose sum is σ = 41041728. Its totient is φ = 3005760.

The previous prime is 12400721. The next prime is 12400741. The reversal of 12400740 is 4700421.

It is a happy number.

12400740 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (12400741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1152 + ... + 5111.

It is an arithmetic number, because the mean of its divisors is an integer number (570024).

Almost surely, 2^12400740 is an apocalyptic number.

12400740 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 12400740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20520864).

12400740 is an abundant number, since it is smaller than the sum of its proper divisors (28640988).

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

12400740 is a wasteful number, since it uses less digits than its factorization.

12400740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6289 (or 6284 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 12400740 is about 3521.4684437036. The cubic root of 12400740 is about 231.4635096511.

The spelling of 12400740 in words is "twelve million, four hundred thousand, seven hundred forty".