400040144 has 20 divisors (see below), whose sum is σ = 885803424. Its totient is φ = 171445728.

The previous prime is 400040143. The next prime is 400040153. The reversal of 400040144 is 441040004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400040143) 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, 1785782 + ... + 1786005.

Almost surely, 2^400040144 is an apocalyptic number.

It is an amenable number.

400040144 is an abundant number, since it is smaller than the sum of its proper divisors (485763280).

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

400040144 is a wasteful number, since it uses less digits than its factorization.

400040144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3571802 (or 3571796 counting only the distinct ones).

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

The square root of 400040144 is about 20001.0035748209. The cubic root of 400040144 is about 736.8309475303.

Adding to 400040144 its reverse (441040004), we get a palindrome (841080148).

It can be divided in two parts, 4000 and 40144, that added together give a palindrome (44144).

The spelling of 400040144 in words is "four hundred million, forty thousand, one hundred forty-four".