401543928820 has 12 divisors (see below), whose sum is σ = 843242250564. Its totient is φ = 160617571520.

The previous prime is 401543928787. The next prime is 401543928823. The reversal of 401543928820 is 28829345104.

It can be written as a sum of positive squares in 2 ways, for example, as 154133189604 + 247410739216 = 392598^2 + 497404^2 .

It is a super-2 number, since 2×401543928820² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401543928823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10038598201 + ... + 10038598240.

It is an arithmetic number, because the mean of its divisors is an integer number (70270187547).

Almost surely, 2^401543928820 is an apocalyptic number.

It is an amenable number.

401543928820 is an abundant number, since it is smaller than the sum of its proper divisors (441698321744).

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

401543928820 is a wasteful number, since it uses less digits than its factorization.

401543928820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20077196450 (or 20077196448 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 46.

The spelling of 401543928820 in words is "four hundred one billion, five hundred forty-three million, nine hundred twenty-eight thousand, eight hundred twenty".