194399780 has 12 divisors (see below), whose sum is σ = 408239580. Its totient is φ = 77759904.

The previous prime is 194399771. The next prime is 194399783. The reversal of 194399780 is 87993491.

It can be written as a sum of positive squares in 2 ways, for example, as 97259044 + 97140736 = 9862^2 + 9856^2 .

It is not an unprimeable number, because it can be changed into a prime (194399783) 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 3 ways as a sum of consecutive naturals, for example, 4859975 + ... + 4860014.

It is an arithmetic number, because the mean of its divisors is an integer number (34019965).

Almost surely, 2^194399780 is an apocalyptic number.

194399780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

194399780 is an abundant number, since it is smaller than the sum of its proper divisors (213839800).

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

194399780 is a wasteful number, since it uses less digits than its factorization.

194399780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9719998 (or 9719996 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 194399780 is about 13942.7321569339. The cubic root of 194399780 is about 579.2934122369.

The spelling of 194399780 in words is "one hundred ninety-four million, three hundred ninety-nine thousand, seven hundred eighty".