12387440 has 80 divisors (see below), whose sum is σ = 31852128. Its totient is φ = 4451328.

The previous prime is 12387433. The next prime is 12387451. The reversal of 12387440 is 4478321.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44582 + ... + 44858.

Almost surely, 2^12387440 is an apocalyptic number.

12387440 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 12387440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15926064).

12387440 is an abundant number, since it is smaller than the sum of its proper divisors (19464688).

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

12387440 is a wasteful number, since it uses less digits than its factorization.

12387440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 12387440 is about 3519.5795203405. The cubic root of 12387440 is about 231.3807305615.

The spelling of 12387440 in words is "twelve million, three hundred eighty-seven thousand, four hundred forty".