220400423 has 4 divisors (see below), whose sum is σ = 220430208. Its totient is φ = 220370640.

The previous prime is 220400417. The next prime is 220400431. The reversal of 220400423 is 324004022.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 220400423 - 2¹⁸ = 220138279 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 (220400123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5690 + ... + 21752.

It is an arithmetic number, because the mean of its divisors is an integer number (55107552).

Almost surely, 2^220400423 is an apocalyptic number.

220400423 is a deficient number, since it is larger than the sum of its proper divisors (29785).

220400423 is a wasteful number, since it uses less digits than its factorization.

220400423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29784.

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 220400423 is about 14845.8890942914. The cubic root of 220400423 is about 604.0471059193.

Adding to 220400423 its reverse (324004022), we get a palindrome (544404445).

The spelling of 220400423 in words is "two hundred twenty million, four hundred thousand, four hundred twenty-three".