400635543 has 16 divisors (see below), whose sum is σ = 665991936. Its totient is φ = 208122240.

The previous prime is 400635509. The next prime is 400635553. The reversal of 400635543 is 345536004.

It is not a de Polignac number, because 400635543 - 2¹² = 400631447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400635543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400635553) 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 15 ways as a sum of consecutive naturals, for example, 866946 + ... + 867407.

It is an arithmetic number, because the mean of its divisors is an integer number (41624496).

Almost surely, 2^400635543 is an apocalyptic number.

400635543 is a deficient number, since it is larger than the sum of its proper divisors (265356393).

400635543 is a wasteful number, since it uses less digits than its factorization.

400635543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734374.

The product of its (nonzero) digits is 21600, while the sum is 30.

The square root of 400635543 is about 20015.8822688384. The cubic root of 400635543 is about 737.1963199772.

The spelling of 400635543 in words is "four hundred million, six hundred thirty-five thousand, five hundred forty-three".