194903640 has 96 divisors (see below), whose sum is σ = 670718880. Its totient is φ = 48915456.

The previous prime is 194903617. The next prime is 194903641. The reversal of 194903640 is 46309491.

194903640 is a `hidden beast` number, since 1 + 9 + 4 + 9 + 0 + 3 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 194903595 and 194903604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194903641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9804 + ... + 22043.

It is an arithmetic number, because the mean of its divisors is an integer number (6986655).

Almost surely, 2^194903640 is an apocalyptic number.

194903640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

194903640 is an abundant number, since it is smaller than the sum of its proper divisors (475815240).

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

194903640 is a wasteful number, since it uses less digits than its factorization.

194903640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31881 (or 31874 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 194903640 is about 13960.7893759630. The cubic root of 194903640 is about 579.7934659005.

The spelling of 194903640 in words is "one hundred ninety-four million, nine hundred three thousand, six hundred forty".