16423438 has 4 divisors (see below), whose sum is σ = 24635160. Its totient is φ = 8211718.

The previous prime is 16423399. The next prime is 16423439. The reversal of 16423438 is 83432461.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16423439) 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 as a sum of consecutive naturals, namely, 4105858 + ... + 4105861.

It is an arithmetic number, because the mean of its divisors is an integer number (6158790).

Almost surely, 2^16423438 is an apocalyptic number.

16423438 is a deficient number, since it is larger than the sum of its proper divisors (8211722).

16423438 is an equidigital number, since it uses as much as digits as its factorization.

16423438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8211721.

The product of its digits is 13824, while the sum is 31.

The square root of 16423438 is about 4052.5841138710. The cubic root of 16423438 is about 254.1877938304.

Adding to 16423438 its reverse (83432461), we get a palindrome (99855899).

It can be divided in two parts, 16423 and 438, that added together give a palindrome (16861).

The spelling of 16423438 in words is "sixteen million, four hundred twenty-three thousand, four hundred thirty-eight".