400040445 has 16 divisors (see below), whose sum is σ = 731502720. Its totient is φ = 182875584.

The previous prime is 400040441. The next prime is 400040503. The reversal of 400040445 is 544040004.

It is not a de Polignac number, because 400040445 - 2² = 400040441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400040441) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1904850 + ... + 1905059.

It is an arithmetic number, because the mean of its divisors is an integer number (45718920).

Almost surely, 2^400040445 is an apocalyptic number.

It is an amenable number.

400040445 is a deficient number, since it is larger than the sum of its proper divisors (331462275).

400040445 is a wasteful number, since it uses less digits than its factorization.

400040445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3809924.

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 400040445 is about 20001.0110994419. The cubic root of 400040445 is about 736.8311323335.

Adding to 400040445 its reverse (544040004), we get a palindrome (944080449).

The spelling of 400040445 in words is "four hundred million, forty thousand, four hundred forty-five".