400044401221243 has 16 divisors (see below), whose sum is σ = 403901342812800. Its totient is φ = 396193122017280.

The previous prime is 400044401221217. The next prime is 400044401221273. The reversal of 400044401221243 is 342122104440004.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 400044401221243 - 2⁹ = 400044401220731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400044401221273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 857551963 + ... + 858018331.

It is an arithmetic number, because the mean of its divisors is an integer number (25243833925800).

Almost surely, 2^{400044401221243} is an apocalyptic number.

400044401221243 is a deficient number, since it is larger than the sum of its proper divisors (3856941591557).

400044401221243 is a wasteful number, since it uses less digits than its factorization.

400044401221243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472422.

The product of its (nonzero) digits is 24576, while the sum is 31.

Adding to 400044401221243 its reverse (342122104440004), we get a palindrome (742166505661247).

The spelling of 400044401221243 in words is "four hundred trillion, forty-four billion, four hundred one million, two hundred twenty-one thousand, two hundred forty-three".