1994189 has 4 divisors (see below), whose sum is σ = 2048124. Its totient is φ = 1940256.

The previous prime is 1994143. The next prime is 1994191. The reversal of 1994189 is 9814991.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1646089 + 348100 = 1283^2 + 590^2 .

It is a cyclic number.

It is not a de Polignac number, because 1994189 - 2⁸ = 1993933 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 (1994119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26912 + ... + 26985.

It is an arithmetic number, because the mean of its divisors is an integer number (512031).

2^1994189 is an apocalyptic number.

It is an amenable number.

1994189 is a deficient number, since it is larger than the sum of its proper divisors (53935).

1994189 is an equidigital number, since it uses as much as digits as its factorization.

1994189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53934.

The product of its digits is 23328, while the sum is 41.

The square root of 1994189 is about 1412.1575691119. The cubic root of 1994189 is about 125.8699632651.

The spelling of 1994189 in words is "one million, nine hundred ninety-four thousand, one hundred eighty-nine".