401243185980 has 960 divisors, whose sum is σ = 1683691806720. Its totient is φ = 77598259200.

The previous prime is 401243185979. The next prime is 401243185991. The reversal of 401243185980 is 89581342104.

401243185980 is a `hidden beast` number, since 4 + 0 + 1 + 2 + 43 + 18 + 598 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 319 ways as a sum of consecutive naturals, for example, 86828070 + ... + 86832690.

It is an arithmetic number, because the mean of its divisors is an integer number (1753845632).

Almost surely, 2^401243185980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 401243185980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (841845903360).

401243185980 is an abundant number, since it is smaller than the sum of its proper divisors (1282448620740).

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

401243185980 is a wasteful number, since it uses less digits than its factorization.

401243185980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4712 (or 4701 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 401243185980 in words is "four hundred one billion, two hundred forty-three million, one hundred eighty-five thousand, nine hundred eighty".