194390390980 has 24 divisors (see below), whose sum is σ = 409248099288. Its totient is φ = 77560293888.

The previous prime is 194390390917. The next prime is 194390390993. The reversal of 194390390980 is 89093093491.

It can be written as a sum of positive squares in 4 ways, for example, as 61235461764 + 133154929216 = 247458^2 + 364904^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12233269 + ... + 12249148.

It is an arithmetic number, because the mean of its divisors is an integer number (17052004137).

Almost surely, 2^194390390980 is an apocalyptic number.

194390390980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

194390390980 is an abundant number, since it is smaller than the sum of its proper divisors (214857708308).

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

194390390980 is a wasteful number, since it uses less digits than its factorization.

194390390980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24482823 (or 24482821 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 55.

The spelling of 194390390980 in words is "one hundred ninety-four billion, three hundred ninety million, three hundred ninety thousand, nine hundred eighty".