423978189 has 8 divisors (see below), whose sum is σ = 574885920. Its totient is φ = 277861296.

The previous prime is 423978187. The next prime is 423978199. The reversal of 423978189 is 981879324.

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

It is not a de Polignac number, because 423978189 - 2¹ = 423978187 is a prime.

It is a Smith number, since the sum of its digits (51) 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 (423978187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1197502 + ... + 1197855.

It is an arithmetic number, because the mean of its divisors is an integer number (71860740).

Almost surely, 2^423978189 is an apocalyptic number.

It is an amenable number.

423978189 is a deficient number, since it is larger than the sum of its proper divisors (150907731).

423978189 is a wasteful number, since it uses less digits than its factorization.

423978189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2395419.

The product of its digits is 870912, while the sum is 51.

The square root of 423978189 is about 20590.7306572642. The cubic root of 423978189 is about 751.2442688075.

It can be divided in two parts, 4239 and 78189, that added together give a palindrome (82428).

The spelling of 423978189 in words is "four hundred twenty-three million, nine hundred seventy-eight thousand, one hundred eighty-nine".