400145444 has 24 divisors (see below), whose sum is σ = 747700800. Its totient is φ = 186921504.

The previous prime is 400145437. The next prime is 400145483. The reversal of 400145444 is 444541004.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46619 + ... + 54530.

It is an arithmetic number, because the mean of its divisors is an integer number (31154200).

Almost surely, 2^400145444 is an apocalyptic number.

It is an amenable number.

400145444 is a deficient number, since it is larger than the sum of its proper divisors (347555356).

400145444 is a wasteful number, since it uses less digits than its factorization.

400145444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101219 (or 101217 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 26.

The square root of 400145444 is about 20003.6357695295. The cubic root of 400145444 is about 736.8955922859.

Adding to 400145444 its reverse (444541004), we get a palindrome (844686448).

The spelling of 400145444 in words is "four hundred million, one hundred forty-five thousand, four hundred forty-four".