400423055 has 4 divisors (see below), whose sum is σ = 480507672. Its totient is φ = 320338440.

The previous prime is 400423027. The next prime is 400423069. The reversal of 400423055 is 550324004.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 400423055 - 2²⁴ = 383645839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400423055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40042301 + ... + 40042310.

It is an arithmetic number, because the mean of its divisors is an integer number (120126918).

Almost surely, 2^400423055 is an apocalyptic number.

400423055 is a deficient number, since it is larger than the sum of its proper divisors (80084617).

400423055 is an equidigital number, since it uses as much as digits as its factorization.

400423055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80084616.

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 400423055 is about 20010.5735799852. The cubic root of 400423055 is about 737.0659661962.

Adding to 400423055 its reverse (550324004), we get a palindrome (950747059).

The spelling of 400423055 in words is "four hundred million, four hundred twenty-three thousand, fifty-five".