194405623 has 4 divisors (see below), whose sum is σ = 198926728. Its totient is φ = 189884520.

The previous prime is 194405611. The next prime is 194405633. The reversal of 194405623 is 326504491.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 194405623 - 2⁹ = 194405111 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 (194405633) 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, 2260488 + ... + 2260573.

It is an arithmetic number, because the mean of its divisors is an integer number (49731682).

Almost surely, 2^194405623 is an apocalyptic number.

194405623 is a deficient number, since it is larger than the sum of its proper divisors (4521105).

194405623 is an equidigital number, since it uses as much as digits as its factorization.

194405623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4521104.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 194405623 is about 13942.9416910493. The cubic root of 194405623 is about 579.2992160458.

The spelling of 194405623 in words is "one hundred ninety-four million, four hundred five thousand, six hundred twenty-three".