194639 has 4 divisors (see below), whose sum is σ = 196080. Its totient is φ = 193200.

The previous prime is 194609. The next prime is 194647. The reversal of 194639 is 936491.

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 194639 - 2¹² = 190543 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 (194609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494 + ... + 795.

It is an arithmetic number, because the mean of its divisors is an integer number (49020).

2¹⁹⁴⁶³⁹ is an apocalyptic number.

194639 is a deficient number, since it is larger than the sum of its proper divisors (1441).

194639 is a wasteful number, since it uses less digits than its factorization.

194639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1440.

The product of its digits is 5832, while the sum is 32.

The square root of 194639 is about 441.1791019529. The cubic root of 194639 is about 57.9530932681.

The spelling of 194639 in words is "one hundred ninety-four thousand, six hundred thirty-nine".