423857815812 has 36 divisors (see below), whose sum is σ = 1071442199100. Its totient is φ = 141282796032.

The previous prime is 423857815811. The next prime is 423857815867. The reversal of 423857815812 is 218518758324.

It is a happy number.

423857815812 is a `hidden beast` number, since 4 + 2 + 3 + 8 + 57 + 8 + 1 + 581 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 370471864896 + 53385950916 = 608664^2 + 231054^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (423857815811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1973248 + ... + 2177480.

Almost surely, 2^423857815812 is an apocalyptic number.

It is an amenable number.

423857815812 is an abundant number, since it is smaller than the sum of its proper divisors (647584383288).

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

423857815812 is a wasteful number, since it uses less digits than its factorization.

423857815812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261892 (or 261887 counting only the distinct ones).

The product of its digits is 4300800, while the sum is 54.

The spelling of 423857815812 in words is "four hundred twenty-three billion, eight hundred fifty-seven million, eight hundred fifteen thousand, eight hundred twelve".