400444444445 has 4 divisors (see below), whose sum is σ = 480533333340. Its totient is φ = 320355555552.

The previous prime is 400444444441. The next prime is 400444444453. The reversal of 400444444445 is 544444444004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 94969365241 + 305475079204 = 308171^2 + 552698^2 .

It is a cyclic number.

It is not a de Polignac number, because 400444444445 - 2² = 400444444441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400444444441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40044444440 + ... + 40044444449.

It is an arithmetic number, because the mean of its divisors is an integer number (120133333335).

Almost surely, 2^400444444445 is an apocalyptic number.

It is an amenable number.

400444444445 is a deficient number, since it is larger than the sum of its proper divisors (80088888895).

400444444445 is an equidigital number, since it uses as much as digits as its factorization.

400444444445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80088888894.

The product of its (nonzero) digits is 1310720, while the sum is 41.

Adding to 400444444445 its reverse (544444444004), we get a palindrome (944888888449).

The spelling of 400444444445 in words is "four hundred billion, four hundred forty-four million, four hundred forty-four thousand, four hundred forty-five".