1723420189 has 4 divisors (see below), whose sum is σ = 1723744800. Its totient is φ = 1723095580.

The previous prime is 1723420183. The next prime is 1723420219. The reversal of 1723420189 is 9810243271.

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.

It is a cyclic number.

It is not a de Polignac number, because 1723420189 - 2¹¹ = 1723418141 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 (1723420183) 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, 154207 + ... + 165004.

It is an arithmetic number, because the mean of its divisors is an integer number (430936200).

Almost surely, 2^1723420189 is an apocalyptic number.

It is an amenable number.

1723420189 is a deficient number, since it is larger than the sum of its proper divisors (324611).

1723420189 is an equidigital number, since it uses as much as digits as its factorization.

1723420189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324610.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 1723420189 is about 41514.0962686170. The cubic root of 1723420189 is about 1198.9389206001.

The spelling of 1723420189 in words is "one billion, seven hundred twenty-three million, four hundred twenty thousand, one hundred eighty-nine".