189019939 has 4 divisors (see below), whose sum is σ = 194128624. Its totient is φ = 183911256.

The previous prime is 189019937. The next prime is 189019969. The reversal of 189019939 is 939910981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 939910981 = 19 ⋅49468999.

It is a cyclic number.

It is not a de Polignac number, because 189019939 - 2¹ = 189019937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 189019892 and 189019901.

It is not an unprimeable number, because it can be changed into a prime (189019937) 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, 2554287 + ... + 2554360.

It is an arithmetic number, because the mean of its divisors is an integer number (48532156).

Almost surely, 2^189019939 is an apocalyptic number.

189019939 is a deficient number, since it is larger than the sum of its proper divisors (5108685).

189019939 is an equidigital number, since it uses as much as digits as its factorization.

189019939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5108684.

The product of its (nonzero) digits is 157464, while the sum is 49.

The square root of 189019939 is about 13748.4522401614. The cubic root of 189019939 is about 573.8995350400.

The spelling of 189019939 in words is "one hundred eighty-nine million, nineteen thousand, nine hundred thirty-nine".