194738405 has 4 divisors (see below), whose sum is σ = 233686092. Its totient is φ = 155790720.

The previous prime is 194738387. The next prime is 194738407. The reversal of 194738405 is 504837491.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79691329 + 115047076 = 8927^2 + 10726^2 .

It is not a de Polignac number, because 194738405 - 2⁸ = 194738149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194738407) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 19473836 + ... + 19473845.

It is an arithmetic number, because the mean of its divisors is an integer number (58421523).

Almost surely, 2^194738405 is an apocalyptic number.

It is an amenable number.

194738405 is a deficient number, since it is larger than the sum of its proper divisors (38947687).

194738405 is an equidigital number, since it uses as much as digits as its factorization.

194738405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38947686.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 194738405 is about 13954.8702967817. The cubic root of 194738405 is about 579.6295742135.

The spelling of 194738405 in words is "one hundred ninety-four million, seven hundred thirty-eight thousand, four hundred five".