400400144 has 20 divisors (see below), whose sum is σ = 792282624. Its totient is φ = 195940128.

The previous prime is 400400131. The next prime is 400400237. The reversal of 400400144 is 441004004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265472 + ... + 266975.

Almost surely, 2^400400144 is an apocalyptic number.

It is an amenable number.

400400144 is a deficient number, since it is larger than the sum of its proper divisors (391882480).

400400144 is a wasteful number, since it uses less digits than its factorization.

400400144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532502 (or 532496 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 400400144 is about 20010.0010994502. The cubic root of 400400144 is about 737.0519083639.

Adding to 400400144 its reverse (441004004), we get a palindrome (841404148).

The spelling of 400400144 in words is "four hundred million, four hundred thousand, one hundred forty-four".