194497445 has 4 divisors (see below), whose sum is σ = 233396940. Its totient is φ = 155597952.

The previous prime is 194497427. The next prime is 194497451. The reversal of 194497445 is 544794491.

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: 544794491 = 23 ⋅23686717.

It can be written as a sum of positive squares in 2 ways, for example, as 39967684 + 154529761 = 6322^2 + 12431^2 .

It is a cyclic number.

It is not a de Polignac number, because 194497445 - 2⁸ = 194497189 is a prime.

It is a super-2 number, since 2×194497445² = 75658512223056050, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 194497445.

It is a congruent 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, 19449740 + ... + 19449749.

It is an arithmetic number, because the mean of its divisors is an integer number (58349235).

Almost surely, 2^194497445 is an apocalyptic number.

It is an amenable number.

194497445 is a deficient number, since it is larger than the sum of its proper divisors (38899495).

194497445 is an equidigital number, since it uses as much as digits as its factorization.

194497445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38899494.

The product of its digits is 725760, while the sum is 47.

The square root of 194497445 is about 13946.2340794926. The cubic root of 194497445 is about 579.3904068926.

The spelling of 194497445 in words is "one hundred ninety-four million, four hundred ninety-seven thousand, four hundred forty-five".