423681918 has 16 divisors (see below), whose sum is σ = 924397056. Its totient is φ = 128388440.

The previous prime is 423681913. The next prime is 423681941. The reversal of 423681918 is 819186324.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 423681918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423681913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3209646 + ... + 3209777.

It is an arithmetic number, because the mean of its divisors is an integer number (57774816).

Almost surely, 2^423681918 is an apocalyptic number.

423681918 is an abundant number, since it is smaller than the sum of its proper divisors (500715138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

423681918 is a wasteful number, since it uses less digits than its factorization.

423681918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6419439.

The product of its digits is 82944, while the sum is 42.

The square root of 423681918 is about 20583.5351191189. The cubic root of 423681918 is about 751.0692411290.

The spelling of 423681918 in words is "four hundred twenty-three million, six hundred eighty-one thousand, nine hundred eighteen".