401856782406 has 32 divisors (see below), whose sum is σ = 820100160000. Its totient is φ = 131247049440.

The previous prime is 401856782389. The next prime is 401856782497. The reversal of 401856782406 is 604287658104.

It is a super-2 number, since 2×401856782406² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3173781 + ... + 3297968.

It is an arithmetic number, because the mean of its divisors is an integer number (25628130000).

Almost surely, 2^401856782406 is an apocalyptic number.

401856782406 is an abundant number, since it is smaller than the sum of its proper divisors (418243377594).

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

401856782406 is a wasteful number, since it uses less digits than its factorization.

401856782406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6471964.

The product of its (nonzero) digits is 2580480, while the sum is 51.

The spelling of 401856782406 in words is "four hundred one billion, eight hundred fifty-six million, seven hundred eighty-two thousand, four hundred six".