12540406812 has 48 divisors (see below), whose sum is σ = 30716851200. Its totient is φ = 3976721280.

The previous prime is 12540406811. The next prime is 12540406819. The reversal of 12540406812 is 21860404521.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12540406811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263737 + ... + 307632.

It is an arithmetic number, because the mean of its divisors is an integer number (639934400).

Almost surely, 2^12540406812 is an apocalyptic number.

12540406812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12540406812 is an abundant number, since it is smaller than the sum of its proper divisors (18176444388).

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

12540406812 is a wasteful number, since it uses less digits than its factorization.

12540406812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571466 (or 571464 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The spelling of 12540406812 in words is "twelve billion, five hundred forty million, four hundred six thousand, eight hundred twelve".