400055 has 16 divisors (see below), whose sum is σ = 518400. Its totient is φ = 295680.

The previous prime is 400051. The next prime is 400067. The reversal of 400055 is 550004.

It is not a de Polignac number, because 400055 - 2² = 400051 is a prime.

400055 is a modest number, since divided by 55 gives 40 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4451 + ... + 4539.

It is an arithmetic number, because the mean of its divisors is an integer number (32400).

2⁴⁰⁰⁰⁵⁵ is an apocalyptic number.

400055 is a deficient number, since it is larger than the sum of its proper divisors (118345).

400055 is a wasteful number, since it uses less digits than its factorization.

400055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154.

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

The square root of 400055 is about 632.4990118569. The cubic root of 400055 is about 73.6840068469.

Adding to 400055 its reverse (550004), we get a palindrome (950059).

The spelling of 400055 in words is "four hundred thousand, fifty-five".