400311144 has 24 divisors (see below), whose sum is σ = 1084176210. Its totient is φ = 133437024.

The previous prime is 400311139. The next prime is 400311151. The reversal of 400311144 is 441113004.

It can be written as a sum of positive squares in only one way, i.e., 293436900 + 106874244 = 17130^2 + 10338^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2779867 + ... + 2780010.

Almost surely, 2^400311144 is an apocalyptic number.

It is an amenable number.

400311144 is an abundant number, since it is smaller than the sum of its proper divisors (683865066).

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

400311144 is a wasteful number, since it uses less digits than its factorization.

400311144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5559889 (or 5559882 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 400311144 is about 20007.7770879226. Note that the first 3 decimals coincide. The cubic root of 400311144 is about 736.9972942637.

Adding to 400311144 its reverse (441113004), we get a palindrome (841424148).

The spelling of 400311144 in words is "four hundred million, three hundred eleven thousand, one hundred forty-four".