194837640 has 32 divisors (see below), whose sum is σ = 584513280. Its totient is φ = 51956672.

The previous prime is 194837579. The next prime is 194837641. The reversal of 194837640 is 46738491.

It is a junction number, because it is equal to n+sod(n) for n = 194837592 and 194837601.

It is not an unprimeable number, because it can be changed into a prime (194837641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 811704 + ... + 811943.

It is an arithmetic number, because the mean of its divisors is an integer number (18266040).

Almost surely, 2^194837640 is an apocalyptic number.

194837640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

194837640 is an abundant number, since it is smaller than the sum of its proper divisors (389675640).

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

194837640 is a wasteful number, since it uses less digits than its factorization.

194837640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623661 (or 1623657 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 194837640 is about 13958.4254126316. The cubic root of 194837640 is about 579.7280135759.

The spelling of 194837640 in words is "one hundred ninety-four million, eight hundred thirty-seven thousand, six hundred forty".