12351542440 has 32 divisors (see below), whose sum is σ = 29425735080. Its totient is φ = 4649992192.

The previous prime is 12351542419. The next prime is 12351542447. The reversal of 12351542440 is 4424515321.

It can be written as a sum of positive squares in 4 ways, for example, as 7672708836 + 4678833604 = 87594^2 + 68402^2 .

It is not an unprimeable number, because it can be changed into a prime (12351542447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9081337 + ... + 9082696.

Almost surely, 2^12351542440 is an apocalyptic number.

12351542440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12351542440 is an abundant number, since it is smaller than the sum of its proper divisors (17074192640).

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

12351542440 is a wasteful number, since it uses less digits than its factorization.

12351542440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18164061 (or 18164057 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

The spelling of 12351542440 in words is "twelve billion, three hundred fifty-one million, five hundred forty-two thousand, four hundred forty".