194194640 has 40 divisors (see below), whose sum is σ = 457232640. Its totient is φ = 76692096.

The previous prime is 194194639. The next prime is 194194657. The reversal of 194194640 is 46491491.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 194194594 and 194194603.

It is a congruent number.

It is an unprimeable number.

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, 9044 + ... + 21683.

It is an arithmetic number, because the mean of its divisors is an integer number (11430816).

Almost surely, 2^194194640 is an apocalyptic number.

194194640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

194194640 is an abundant number, since it is smaller than the sum of its proper divisors (263038000).

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

194194640 is a wasteful number, since it uses less digits than its factorization.

194194640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30819 (or 30813 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 194194640 is about 13935.3736943076. The cubic root of 194194640 is about 579.0895744279.

The spelling of 194194640 in words is "one hundred ninety-four million, one hundred ninety-four thousand, six hundred forty".