400543361 has 4 divisors (see below), whose sum is σ = 404672772. Its totient is φ = 396413952.

The previous prime is 400543357. The next prime is 400543379. The reversal of 400543361 is 163345004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 331968400 + 68574961 = 18220^2 + 8281^2 .

It is a cyclic number.

It is not a de Polignac number, because 400543361 - 2² = 400543357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400543361.

It is not an unprimeable number, because it can be changed into a prime (400543961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2064560 + ... + 2064753.

It is an arithmetic number, because the mean of its divisors is an integer number (101168193).

Almost surely, 2^400543361 is an apocalyptic number.

It is an amenable number.

400543361 is a deficient number, since it is larger than the sum of its proper divisors (4129411).

400543361 is an equidigital number, since it uses as much as digits as its factorization.

400543361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4129410.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 400543361 is about 20013.5794149872. The cubic root of 400543361 is about 737.1397752821.

Adding to 400543361 its reverse (163345004), we get a palindrome (563888365).

The spelling of 400543361 in words is "four hundred million, five hundred forty-three thousand, three hundred sixty-one".