194421408 has 48 divisors (see below), whose sum is σ = 512971200. Its totient is φ = 64475136.

The previous prime is 194421397. The next prime is 194421413. The reversal of 194421408 is 804124491.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14016 + ... + 24192.

It is an arithmetic number, because the mean of its divisors is an integer number (10686900).

Almost surely, 2^194421408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 194421408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256485600).

194421408 is an abundant number, since it is smaller than the sum of its proper divisors (318549792).

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

194421408 is a wasteful number, since it uses less digits than its factorization.

194421408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10389 (or 10381 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 194421408 is about 13943.5077365776. The cubic root of 194421408 is about 579.3148945886.

Adding to 194421408 its reverse (804124491), we get a palindrome (998545899).

The spelling of 194421408 in words is "one hundred ninety-four million, four hundred twenty-one thousand, four hundred eight".