400004405 has 16 divisors (see below), whose sum is σ = 499068864. Its totient is φ = 307528320.

The previous prime is 400004399. The next prime is 400004419. The reversal of 400004405 is 504400004.

It is not a de Polignac number, because 400004405 - 2¹⁰ = 400003381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 827 + ... + 28296.

It is an arithmetic number, because the mean of its divisors is an integer number (31191804).

Almost surely, 2^400004405 is an apocalyptic number.

It is an amenable number.

400004405 is a deficient number, since it is larger than the sum of its proper divisors (99064459).

400004405 is a wasteful number, since it uses less digits than its factorization.

400004405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29236.

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 400004405 is about 20000.1101246968. The cubic root of 400004405 is about 736.8090044113.

Adding to 400004405 its reverse (504400004), we get a palindrome (904404409).

The spelling of 400004405 in words is "four hundred million, four thousand, four hundred five".