194449640 has 192 divisors, whose sum is σ = 576201600. Its totient is φ = 58329600.

The previous prime is 194449579. The next prime is 194449649. The reversal of 194449640 is 46944491.

It is a happy number.

It is a super-2 number, since 2×194449640² = 75621324992259200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194449649) 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 47 ways as a sum of consecutive naturals, for example, 625085 + ... + 625395.

It is an arithmetic number, because the mean of its divisors is an integer number (3001050).

Almost surely, 2^194449640 is an apocalyptic number.

194449640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 194449640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288100800).

194449640 is an abundant number, since it is smaller than the sum of its proper divisors (381751960).

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

194449640 is a wasteful number, since it uses less digits than its factorization.

194449640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376 (or 365 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 194449640 is about 13944.5200706227. The cubic root of 194449640 is about 579.3429340702.

The spelling of 194449640 in words is "one hundred ninety-four million, four hundred forty-nine thousand, six hundred forty".