12387540 has 72 divisors (see below), whose sum is σ = 38116512. Its totient is φ = 2981120.

The previous prime is 12387539. The next prime is 12387619. The reversal of 12387540 is 4578321.

It is a super-2 number, since 2×12387540² = 306902294503200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 12387498 and 12387507.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 90352 + ... + 90488.

It is an arithmetic number, because the mean of its divisors is an integer number (529396).

Almost surely, 2^12387540 is an apocalyptic number.

12387540 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 12387540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19058256).

12387540 is an abundant number, since it is smaller than the sum of its proper divisors (25728972).

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

12387540 is a wasteful number, since it uses less digits than its factorization.

12387540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 12387540 is about 3519.5937265542. The cubic root of 12387540 is about 231.3813531816.

It can be divided in two parts, 1238 and 7540, that added together give a palindrome (8778).

The spelling of 12387540 in words is "twelve million, three hundred eighty-seven thousand, five hundred forty".