400243423 has 4 divisors (see below), whose sum is σ = 401720608. Its totient is φ = 398766240.

The previous prime is 400243373. The next prime is 400243457. The reversal of 400243423 is 324342004.

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 400243423 - 2⁹ = 400242911 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400243394 and 400243403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400243483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 738186 + ... + 738727.

It is an arithmetic number, because the mean of its divisors is an integer number (100430152).

Almost surely, 2^400243423 is an apocalyptic number.

400243423 is a deficient number, since it is larger than the sum of its proper divisors (1477185).

400243423 is a wasteful number, since it uses less digits than its factorization.

400243423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1477184.

The product of its (nonzero) digits is 2304, while the sum is 22.

The square root of 400243423 is about 20006.0846494260. The cubic root of 400243423 is about 736.9557324193.

Adding to 400243423 its reverse (324342004), we get a palindrome (724585427).

The spelling of 400243423 in words is "four hundred million, two hundred forty-three thousand, four hundred twenty-three".