401640543 has 6 divisors (see below), whose sum is σ = 580147464. Its totient is φ = 267760356.

The previous prime is 401640529. The next prime is 401640607. The reversal of 401640543 is 345046104.

It is not a de Polignac number, because 401640543 - 2¹⁰ = 401639519 is a prime.

It is a super-2 number, since 2×401640543² = 322630251562669698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401644543) 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 5 ways as a sum of consecutive naturals, for example, 22313355 + ... + 22313372.

It is an arithmetic number, because the mean of its divisors is an integer number (96691244).

Almost surely, 2^401640543 is an apocalyptic number.

401640543 is a deficient number, since it is larger than the sum of its proper divisors (178506921).

401640543 is a wasteful number, since it uses less digits than its factorization.

401640543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44626733 (or 44626730 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 401640543 is about 20040.9716081831. The cubic root of 401640543 is about 737.8122277699.

Adding to 401640543 its reverse (345046104), we get a palindrome (746686647).

The spelling of 401640543 in words is "four hundred one million, six hundred forty thousand, five hundred forty-three".