423889199806 has 4 divisors (see below), whose sum is σ = 635833799712. Its totient is φ = 211944599902.

The previous prime is 423889199771. The next prime is 423889199809. The reversal of 423889199806 is 608991988324.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423889199809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105972299950 + ... + 105972299953.

It is an arithmetic number, because the mean of its divisors is an integer number (158958449928).

Almost surely, 2^423889199806 is an apocalyptic number.

423889199806 is a deficient number, since it is larger than the sum of its proper divisors (211944599906).

423889199806 is a wasteful number, since it uses less digits than its factorization.

423889199806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211944599905.

The product of its (nonzero) digits is 53747712, while the sum is 67.

The spelling of 423889199806 in words is "four hundred twenty-three billion, eight hundred eighty-nine million, one hundred ninety-nine thousand, eight hundred six".