194894905 has 4 divisors (see below), whose sum is σ = 233873892. Its totient is φ = 155915920.

The previous prime is 194894881. The next prime is 194894941. The reversal of 194894905 is 509498491.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 509498491 = 11071 ⋅46021.

It can be written as a sum of positive squares in 2 ways, for example, as 151585344 + 43309561 = 12312^2 + 6581^2 .

It is not a de Polignac number, because 194894905 - 2⁹ = 194894393 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 19489486 + ... + 19489495.

It is an arithmetic number, because the mean of its divisors is an integer number (58468473).

Almost surely, 2^194894905 is an apocalyptic number.

It is an amenable number.

194894905 is a deficient number, since it is larger than the sum of its proper divisors (38978987).

194894905 is an equidigital number, since it uses as much as digits as its factorization.

194894905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38978986.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 194894905 is about 13960.4765319813. The cubic root of 194894905 is about 579.7848042330.

The spelling of 194894905 in words is "one hundred ninety-four million, eight hundred ninety-four thousand, nine hundred five".