400442223 has 4 divisors (see below), whose sum is σ = 533922968. Its totient is φ = 266961480.

The previous prime is 400442197. The next prime is 400442243. The reversal of 400442223 is 322244004.

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

It is not a de Polignac number, because 400442223 - 2¹⁰ = 400441199 is a prime.

It is a super-2 number, since 2×400442223² = 320707947922363458, which contains 22 as substring.

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 400442223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400442243) 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, 66740368 + ... + 66740373.

It is an arithmetic number, because the mean of its divisors is an integer number (133480742).

Almost surely, 2^400442223 is an apocalyptic number.

400442223 is a deficient number, since it is larger than the sum of its proper divisors (133480745).

400442223 is a wasteful number, since it uses less digits than its factorization.

400442223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133480744.

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 400442223 is about 20011.0525210445. The cubic root of 400442223 is about 737.0777269701.

Adding to 400442223 its reverse (322244004), we get a palindrome (722686227).

The spelling of 400442223 in words is "four hundred million, four hundred forty-two thousand, two hundred twenty-three".