400444240442 has 16 divisors (see below), whose sum is σ = 601539345000. Its totient is φ = 199931289600.

The previous prime is 400444240423. The next prime is 400444240457. The reversal of 400444240442 is 244042444004.

It can be written as a sum of positive squares in 4 ways, for example, as 293502814081 + 106941426361 = 541759^2 + 327019^2 .

It is a junction number, because it is equal to n+sod(n) for n = 400444240399 and 400444240408.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5068442 + ... + 5146842.

Almost surely, 2^400444240442 is an apocalyptic number.

400444240442 is a deficient number, since it is larger than the sum of its proper divisors (201095104558).

400444240442 is a wasteful number, since it uses less digits than its factorization.

400444240442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82081.

The product of its (nonzero) digits is 65536, while the sum is 32.

Adding to 400444240442 its reverse (244042444004), we get a palindrome (644486684446).

The spelling of 400444240442 in words is "four hundred billion, four hundred forty-four million, two hundred forty thousand, four hundred forty-two".