400444004001 has 4 divisors (see below), whose sum is σ = 533925338672. Its totient is φ = 266962669332.

The previous prime is 400444003979. The next prime is 400444004011. The reversal of 400444004001 is 100400444004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 400444004001 - 2¹¹ = 400444001953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400444004011) 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, 66740667331 + ... + 66740667336.

It is an arithmetic number, because the mean of its divisors is an integer number (133481334668).

Almost surely, 2^400444004001 is an apocalyptic number.

It is an amenable number.

400444004001 is a deficient number, since it is larger than the sum of its proper divisors (133481334671).

400444004001 is a wasteful number, since it uses less digits than its factorization.

400444004001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133481334670.

The product of its (nonzero) digits is 1024, while the sum is 21.

Adding to 400444004001 its reverse (100400444004), we get a palindrome (500844448005).

The spelling of 400444004001 in words is "four hundred billion, four hundred forty-four million, four thousand, one".