400004445 has 16 divisors (see below), whose sum is σ = 643937472. Its totient is φ = 212025600.

The previous prime is 400004419. The next prime is 400004471. The reversal of 400004445 is 544400004.

It is an interprime number because it is at equal distance from previous prime (400004419) and next prime (400004471).

It is not a de Polignac number, because 400004445 - 2¹¹ = 400002397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79356 + ... + 84245.

It is an arithmetic number, because the mean of its divisors is an integer number (40246092).

Almost surely, 2^400004445 is an apocalyptic number.

It is an amenable number.

400004445 is a deficient number, since it is larger than the sum of its proper divisors (243933027).

400004445 is a wasteful number, since it uses less digits than its factorization.

400004445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163772.

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

The square root of 400004445 is about 20000.1111246913. Note that the first 4 decimals coincide. The cubic root of 400004445 is about 736.8090289713.

Adding to 400004445 its reverse (544400004), we get a palindrome (944404449).

The spelling of 400004445 in words is "four hundred million, four thousand, four hundred forty-five".