189837221 has 6 divisors (see below), whose sum is σ = 220831110. Its totient is φ = 162717576.

The previous prime is 189837203. The next prime is 189837229. The reversal of 189837221 is 122738981.

It can be written as a sum of positive squares in only one way, i.e., 185368225 + 4468996 = 13615^2 + 2114^2 .

It is not a de Polignac number, because 189837221 - 2²⁶ = 122728357 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 (189837229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1937066 + ... + 1937163.

It is an arithmetic number, because the mean of its divisors is an integer number (36805185).

Almost surely, 2^189837221 is an apocalyptic number.

It is an amenable number.

189837221 is a deficient number, since it is larger than the sum of its proper divisors (30993889).

189837221 is an equidigital number, since it uses as much as digits as its factorization.

189837221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3874243 (or 3874236 counting only the distinct ones).

The product of its digits is 48384, while the sum is 41.

The square root of 189837221 is about 13778.1428719548. The cubic root of 189837221 is about 574.7254855984.

The spelling of 189837221 in words is "one hundred eighty-nine million, eight hundred thirty-seven thousand, two hundred twenty-one".