400423203442 has 4 divisors (see below), whose sum is σ = 600634805166. Its totient is φ = 200211601720.

The previous prime is 400423203437. The next prime is 400423203449. The reversal of 400423203442 is 244302324004.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 395264947401 + 5158256041 = 628701^2 + 71821^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 400423203442.

It is not an unprimeable number, because it can be changed into a prime (400423203449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100105800859 + ... + 100105800862.

Almost surely, 2^400423203442 is an apocalyptic number.

400423203442 is a deficient number, since it is larger than the sum of its proper divisors (200211601724).

400423203442 is a wasteful number, since it uses less digits than its factorization.

400423203442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200211601723.

The product of its (nonzero) digits is 18432, while the sum is 28.

Adding to 400423203442 its reverse (244302324004), we get a palindrome (644725527446).

The spelling of 400423203442 in words is "four hundred billion, four hundred twenty-three million, two hundred three thousand, four hundred forty-two".