194812820 has 18 divisors (see below), whose sum is σ = 409238046. Its totient is φ = 77900160.

The previous prime is 194812817. The next prime is 194812831. The reversal of 194812820 is 28218491.

It can be written as a sum of positive squares in 3 ways, for example, as 35093776 + 159719044 = 5924^2 + 12638^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 60860 + ... + 63980.

It is an arithmetic number, because the mean of its divisors is an integer number (22735447).

Almost surely, 2^194812820 is an apocalyptic number.

194812820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

194812820 is an abundant number, since it is smaller than the sum of its proper divisors (214425226).

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

194812820 is an frugal number, since it uses more digits than its factorization.

194812820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6251 (or 3128 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 194812820 is about 13957.5363155537. The cubic root of 194812820 is about 579.7033957106.

The spelling of 194812820 in words is "one hundred ninety-four million, eight hundred twelve thousand, eight hundred twenty".