400404005 has 8 divisors (see below), whose sum is σ = 505773600. Its totient is φ = 303464016.

The previous prime is 400403963. The next prime is 400404007. The reversal of 400404005 is 500404004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400404005 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400404007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2107295 + ... + 2107484.

It is an arithmetic number, because the mean of its divisors is an integer number (63221700).

Almost surely, 2^400404005 is an apocalyptic number.

It is an amenable number.

400404005 is a deficient number, since it is larger than the sum of its proper divisors (105369595).

400404005 is a wasteful number, since it uses less digits than its factorization.

400404005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4214803.

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

The square root of 400404005 is about 20010.0975759740. The cubic root of 400404005 is about 737.0542774509.

Adding to 400404005 its reverse (500404004), we get a palindrome (900808009).

Subtracting 400404005 from its reverse (500404004), we obtain a palindrome (99999999).

The spelling of 400404005 in words is "four hundred million, four hundred four thousand, five".