423778188 has 24 divisors (see below), whose sum is σ = 996367680. Its totient is φ = 140180560.

The previous prime is 423778183. The next prime is 423778211. The reversal of 423778188 is 881877324.

It is a happy number.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (423778183) 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 7 ways as a sum of consecutive naturals, for example, 133218 + ... + 136361.

It is an arithmetic number, because the mean of its divisors is an integer number (41515320).

Almost surely, 2^423778188 is an apocalyptic number.

It is an amenable number.

423778188 is an abundant number, since it is smaller than the sum of its proper divisors (572589492).

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

423778188 is a wasteful number, since it uses less digits than its factorization.

423778188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269717 (or 269715 counting only the distinct ones).

The product of its digits is 602112, while the sum is 48.

The square root of 423778188 is about 20585.8735058778. The cubic root of 423778188 is about 751.1261233930.

The spelling of 423778188 in words is "four hundred twenty-three million, seven hundred seventy-eight thousand, one hundred eighty-eight".