400002306444 has 144 divisors (see below), whose sum is σ = 1137560878272. Its totient is φ = 117589418496.

The previous prime is 400002306443. The next prime is 400002306461. The reversal of 400002306444 is 444603200004.

It is not an unprimeable number, because it can be changed into a prime (400002306443) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9418842 + ... + 9461214.

Almost surely, 2^400002306444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400002306444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (568780439136).

400002306444 is an abundant number, since it is smaller than the sum of its proper divisors (737558571828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400002306444 is a wasteful number, since it uses less digits than its factorization.

400002306444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43296 (or 43291 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 400002306444 its reverse (444603200004), we get a palindrome (844605506448).

The spelling of 400002306444 in words is "four hundred billion, two million, three hundred six thousand, four hundred forty-four".