401973391872 has 240 divisors, whose sum is σ = 1255006841088. Its totient is φ = 123125391360.

The previous prime is 401973391801. The next prime is 401973391877. The reversal of 401973391872 is 278193379104.

401973391872 is a `hidden beast` number, since 40 + 1 + 97 + 339 + 187 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (401973391877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13343547 + ... + 13373637.

Almost surely, 2^401973391872 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 401973391872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (627503420544).

401973391872 is an abundant number, since it is smaller than the sum of its proper divisors (853033449216).

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

401973391872 is a wasteful number, since it uses less digits than its factorization.

401973391872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30351 (or 30332 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The spelling of 401973391872 in words is "four hundred one billion, nine hundred seventy-three million, three hundred ninety-one thousand, eight hundred seventy-two".