12531440340 has 60 divisors (see below), whose sum is σ = 39311597556. Its totient is φ = 3341716992.

The previous prime is 12531440323. The next prime is 12531440407. The reversal of 12531440340 is 4304413521.

It is a happy number.

12531440340 is a `hidden beast` number, since 1 + 2 + 5 + 314 + 4 + 0 + 340 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7567956036 + 4963484304 = 86994^2 + 70452^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3866109 + ... + 3869348.

Almost surely, 2^12531440340 is an apocalyptic number.

12531440340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12531440340 is an abundant number, since it is smaller than the sum of its proper divisors (26780157216).

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

12531440340 is a wasteful number, since it uses less digits than its factorization.

12531440340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7735478 (or 7735467 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 12531440340 its reverse (4304413521), we get a palindrome (16835853861).

The spelling of 12531440340 in words is "twelve billion, five hundred thirty-one million, four hundred forty thousand, three hundred forty".