423857081840 has 40 divisors (see below), whose sum is σ = 1043436407760. Its totient is φ = 159569724416.

The previous prime is 423857081831. The next prime is 423857081849. The reversal of 423857081840 is 48180758324.

It is an interprime number because it is at equal distance from previous prime (423857081831) and next prime (423857081849).

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423857081849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155828450 + ... + 155831169.

It is an arithmetic number, because the mean of its divisors is an integer number (26085910194).

Almost surely, 2^423857081840 is an apocalyptic number.

423857081840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

423857081840 is an abundant number, since it is smaller than the sum of its proper divisors (619579325920).

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

423857081840 is a wasteful number, since it uses less digits than its factorization.

423857081840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311659649 (or 311659643 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 50.

The spelling of 423857081840 in words is "four hundred twenty-three billion, eight hundred fifty-seven million, eighty-one thousand, eight hundred forty".