400505 has 8 divisors (see below), whose sum is σ = 549312. Its totient is φ = 274608.

The previous prime is 400481. The next prime is 400523. The reversal of 400505 is 505004.

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

It is a cyclic number.

It is not a de Polignac number, because 400505 - 2⁶ = 400441 is a prime.

It is a Duffinian number.

400505 is a modest number, since divided by 505 gives 40 as remainder.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 400505.

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, 5687 + ... + 5756.

It is an arithmetic number, because the mean of its divisors is an integer number (68664).

2⁴⁰⁰⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

400505 is a deficient number, since it is larger than the sum of its proper divisors (148807).

400505 is a wasteful number, since it uses less digits than its factorization.

400505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11455.

The product of its (nonzero) digits is 100, while the sum is 14.

The square root of 400505 is about 632.8546436584. The cubic root of 400505 is about 73.7116241982.

Adding to 400505 its reverse (505004), we get a palindrome (905509).

The spelling of 400505 in words is "four hundred thousand, five hundred five".