194421788 has 12 divisors (see below), whose sum is σ = 371168952. Its totient is φ = 88373520.

The previous prime is 194421781. The next prime is 194421797. The reversal of 194421788 is 887124491.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 4418677 = 194421788 / (1 + 9 + 4 + 4 + 2 + 1 + 7 + 8 + 8).

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194421781) 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 3 ways as a sum of consecutive naturals, for example, 2209295 + ... + 2209382.

It is an arithmetic number, because the mean of its divisors is an integer number (30930746).

Almost surely, 2^194421788 is an apocalyptic number.

It is an amenable number.

194421788 is a deficient number, since it is larger than the sum of its proper divisors (176747164).

194421788 is a wasteful number, since it uses less digits than its factorization.

194421788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4418692 (or 4418690 counting only the distinct ones).

The product of its digits is 129024, while the sum is 44.

The square root of 194421788 is about 13943.5213629843. The cubic root of 194421788 is about 579.3152720153.

It can be divided in two parts, 1944 and 21788, that added together give a palindrome (23732).

The spelling of 194421788 in words is "one hundred ninety-four million, four hundred twenty-one thousand, seven hundred eighty-eight".