400543938 has 24 divisors (see below), whose sum is σ = 869387376. Its totient is φ = 133277400.

The previous prime is 400543937. The next prime is 400543961. The reversal of 400543938 is 839345004.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (400543931) 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, 9208 + ... + 29763.

It is an arithmetic number, because the mean of its divisors is an integer number (36224474).

Almost surely, 2^400543938 is an apocalyptic number.

400543938 is an abundant number, since it is smaller than the sum of its proper divisors (468843438).

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

400543938 is a wasteful number, since it uses less digits than its factorization.

400543938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39550 (or 39547 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 400543938 is about 20013.5938301945. The cubic root of 400543938 is about 737.1401292425.

The spelling of 400543938 in words is "four hundred million, five hundred forty-three thousand, nine hundred thirty-eight".