400244404442 has 4 divisors (see below), whose sum is σ = 600366606666. Its totient is φ = 200122202220.

The previous prime is 400244404403. The next prime is 400244404457. The reversal of 400244404442 is 244404442004.

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., 338466804841 + 61777599601 = 581779^2 + 248551^2 .

It is a junction number, because it is equal to n+sod(n) for n = 400244404399 and 400244404408.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100061101109 + ... + 100061101112.

Almost surely, 2^400244404442 is an apocalyptic number.

400244404442 is a deficient number, since it is larger than the sum of its proper divisors (200122202224).

400244404442 is a wasteful number, since it uses less digits than its factorization.

400244404442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200122202223.

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

Adding to 400244404442 its reverse (244404442004), we get a palindrome (644648846446).

The spelling of 400244404442 in words is "four hundred billion, two hundred forty-four million, four hundred four thousand, four hundred forty-two".