12543405240 has 64 divisors (see below), whose sum is σ = 37652700960. Its totient is φ = 3342909440.

The previous prime is 12543405221. The next prime is 12543405253. The reversal of 12543405240 is 4250434521.

It is a super-4 number, since 4×12543405240⁴ (a number of 41 digits) contains 4444 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 = 12543405198 and 12543405207.

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, 176152 + ... + 236888.

Almost surely, 2^12543405240 is an apocalyptic number.

12543405240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12543405240 is an abundant number, since it is smaller than the sum of its proper divisors (25109295720).

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

12543405240 is a wasteful number, since it uses less digits than its factorization.

12543405240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62472 (or 62468 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 12543405240 its reverse (4250434521), we get a palindrome (16793839761).

The spelling of 12543405240 in words is "twelve billion, five hundred forty-three million, four hundred five thousand, two hundred forty".