400205423 has 8 divisors (see below), whose sum is σ = 422815680. Its totient is φ = 378182560.

The previous prime is 400205401. The next prime is 400205441. The reversal of 400205423 is 324502004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400205423 - 2¹⁸ = 399943279 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400205395 and 400205404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400205023) 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 7 ways as a sum of consecutive naturals, for example, 145448 + ... + 148173.

It is an arithmetic number, because the mean of its divisors is an integer number (52851960).

Almost surely, 2^400205423 is an apocalyptic number.

400205423 is a deficient number, since it is larger than the sum of its proper divisors (22610257).

400205423 is a wasteful number, since it uses less digits than its factorization.

400205423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293697.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 400205423 is about 20005.1349158160. The cubic root of 400205423 is about 736.9324089429.

Adding to 400205423 its reverse (324502004), we get a palindrome (724707427).

The spelling of 400205423 in words is "four hundred million, two hundred five thousand, four hundred twenty-three".