400455 has 24 divisors (see below), whose sum is σ = 758160. Its totient is φ = 193920.

The previous prime is 400441. The next prime is 400457. The reversal of 400455 is 554004.

400455 = 281² + 282² + ... + 285².

It is a happy number.

It is not a de Polignac number, because 400455 - 2⁶ = 400391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400457) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91 + ... + 899.

It is an arithmetic number, because the mean of its divisors is an integer number (31590).

2⁴⁰⁰⁴⁵⁵ is an apocalyptic number.

400455 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

400455 is a deficient number, since it is larger than the sum of its proper divisors (357705).

400455 is a wasteful number, since it uses less digits than its factorization.

400455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831 (or 828 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 400455 is about 632.8151388834. The cubic root of 400455 is about 73.7085566255.

Adding to 400455 its reverse (554004), we get a palindrome (954459).

The spelling of 400455 in words is "four hundred thousand, four hundred fifty-five".