194782489 has 4 divisors (see below), whose sum is σ = 212490000. Its totient is φ = 177074980.

The previous prime is 194782487. The next prime is 194782493. The reversal of 194782489 is 984287491.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 984287491 = 11 ⋅89480681.

It is a cyclic number.

It is not a de Polignac number, because 194782489 - 2¹ = 194782487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194782487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8853739 + ... + 8853760.

It is an arithmetic number, because the mean of its divisors is an integer number (53122500).

Almost surely, 2^194782489 is an apocalyptic number.

It is an amenable number.

194782489 is a deficient number, since it is larger than the sum of its proper divisors (17707511).

194782489 is a wasteful number, since it uses less digits than its factorization.

194782489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17707510.

The product of its digits is 1161216, while the sum is 52.

The square root of 194782489 is about 13956.4497276349. The cubic root of 194782489 is about 579.6733088880.

The spelling of 194782489 in words is "one hundred ninety-four million, seven hundred eighty-two thousand, four hundred eighty-nine".