400002144 has 24 divisors (see below), whose sum is σ = 1050005880. Its totient is φ = 133334016.

The previous prime is 400002089. The next prime is 400002151. The reversal of 400002144 is 441200004.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2083249 + ... + 2083440.

It is an arithmetic number, because the mean of its divisors is an integer number (43750245).

Almost surely, 2^400002144 is an apocalyptic number.

It is an amenable number.

400002144 is an abundant number, since it is smaller than the sum of its proper divisors (650003736).

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

400002144 is a wasteful number, since it uses less digits than its factorization.

400002144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4166702 (or 4166694 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 400002144 is about 20000.0535999282. The cubic root of 400002144 is about 736.8076161530.

Adding to 400002144 its reverse (441200004), we get a palindrome (841202148).

The spelling of 400002144 in words is "four hundred million, two thousand, one hundred forty-four".