400342543 has 4 divisors (see below), whose sum is σ = 400397128. Its totient is φ = 400287960.

The previous prime is 400342519. The next prime is 400342561. The reversal of 400342543 is 345243004.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400342543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400342043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14196 + ... + 31657.

It is an arithmetic number, because the mean of its divisors is an integer number (100099282).

Almost surely, 2^400342543 is an apocalyptic number.

400342543 is a deficient number, since it is larger than the sum of its proper divisors (54585).

400342543 is an equidigital number, since it uses as much as digits as its factorization.

400342543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54584.

The product of its (nonzero) digits is 5760, while the sum is 25.

The square root of 400342543 is about 20008.5617424142. The cubic root of 400342543 is about 737.0165629196.

Adding to 400342543 its reverse (345243004), we get a palindrome (745585547).

The spelling of 400342543 in words is "four hundred million, three hundred forty-two thousand, five hundred forty-three".