401971843 has 12 divisors (see below), whose sum is σ = 503569920. Its totient is φ = 318043152.

The previous prime is 401971807. The next prime is 401971873. The reversal of 401971843 is 348179104.

It is a de Polignac number, because none of the positive numbers 2^k-401971843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (401971873) 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 11 ways as a sum of consecutive naturals, for example, 314883 + ... + 316156.

It is an arithmetic number, because the mean of its divisors is an integer number (41964160).

Almost surely, 2^401971843 is an apocalyptic number.

401971843 is a deficient number, since it is larger than the sum of its proper divisors (101598077).

401971843 is a wasteful number, since it uses less digits than its factorization.

401971843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631066 (or 631059 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 401971843 is about 20049.2354717081. The cubic root of 401971843 is about 738.0150376511.

The spelling of 401971843 in words is "four hundred one million, nine hundred seventy-one thousand, eight hundred forty-three".