400312223 has 4 divisors (see below), whose sum is σ = 401403360. Its totient is φ = 399221088.

The previous prime is 400312183. The next prime is 400312229. The reversal of 400312223 is 322213004.

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

It is a cyclic number.

It is not a de Polignac number, because 400312223 - 2¹⁰ = 400311199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400312229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545018 + ... + 545751.

It is an arithmetic number, because the mean of its divisors is an integer number (100350840).

Almost surely, 2^400312223 is an apocalyptic number.

400312223 is a deficient number, since it is larger than the sum of its proper divisors (1091137).

400312223 is a wasteful number, since it uses less digits than its factorization.

400312223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091136.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 400312223 is about 20007.8040524191. The cubic root of 400312223 is about 736.9979564315.

Adding to 400312223 its reverse (322213004), we get a palindrome (722525227).

The spelling of 400312223 in words is "four hundred million, three hundred twelve thousand, two hundred twenty-three".