189844945 has 4 divisors (see below), whose sum is σ = 227813940. Its totient is φ = 151875952.

The previous prime is 189844943. The next prime is 189844981. The reversal of 189844945 is 549448981.

189844945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 20948929 + 168896016 = 4577^2 + 12996^2 .

It is a cyclic number.

It is not a de Polignac number, because 189844945 - 2¹ = 189844943 is a prime.

It is a super-2 number, since 2×189844945² = 72082206284106050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 189844892 and 189844901.

It is not an unprimeable number, because it can be changed into a prime (189844943) 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, 18984490 + ... + 18984499.

It is an arithmetic number, because the mean of its divisors is an integer number (56953485).

Almost surely, 2^189844945 is an apocalyptic number.

It is an amenable number.

189844945 is a deficient number, since it is larger than the sum of its proper divisors (37968995).

189844945 is an equidigital number, since it uses as much as digits as its factorization.

189844945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37968994.

The product of its digits is 1658880, while the sum is 52.

The square root of 189844945 is about 13778.4231681278. The cubic root of 189844945 is about 574.7332802051.

The spelling of 189844945 in words is "one hundred eighty-nine million, eight hundred forty-four thousand, nine hundred forty-five".