194990443 has 4 divisors (see below), whose sum is σ = 195048448. Its totient is φ = 194932440.

The previous prime is 194990431. The next prime is 194990447. The reversal of 194990443 is 344099491.

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: 344099491 = 83 ⋅4145777.

It is a cyclic number.

It is not a de Polignac number, because 194990443 - 2⁹ = 194989931 is a prime.

It is a super-2 number, since 2×194990443² = 76042545722672498, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 194990443.

It is not an unprimeable number, because it can be changed into a prime (194990447) 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, 23628 + ... + 30793.

It is an arithmetic number, because the mean of its divisors is an integer number (48762112).

Almost surely, 2^194990443 is an apocalyptic number.

194990443 is a deficient number, since it is larger than the sum of its proper divisors (58005).

194990443 is an equidigital number, since it uses as much as digits as its factorization.

194990443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58004.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 194990443 is about 13963.8978440835. The cubic root of 194990443 is about 579.8795261073.

The spelling of 194990443 in words is "one hundred ninety-four million, nine hundred ninety thousand, four hundred forty-three".