401787421784 has 32 divisors (see below), whose sum is σ = 861201331200. Its totient is φ = 172148952480.

The previous prime is 401787421753. The next prime is 401787421787. The reversal of 401787421784 is 487124787104.

It is a happy number.

It is a super-2 number, since 2×401787421784² (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 (401787421787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 737672 + ... + 1160919.

It is an arithmetic number, because the mean of its divisors is an integer number (26912541600).

Almost surely, 2^401787421784 is an apocalyptic number.

It is an amenable number.

401787421784 is an abundant number, since it is smaller than the sum of its proper divisors (459413909416).

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

401787421784 is a wasteful number, since it uses less digits than its factorization.

401787421784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1902383 (or 1902379 counting only the distinct ones).

The product of its (nonzero) digits is 2809856, while the sum is 53.

The spelling of 401787421784 in words is "four hundred one billion, seven hundred eighty-seven million, four hundred twenty-one thousand, seven hundred eighty-four".