189390145 has 12 divisors (see below), whose sum is σ = 264373524. Its totient is φ = 129867360.

The previous prime is 189390143. The next prime is 189390151. The reversal of 189390145 is 541093981.

189390145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 135675904 + 53714241 = 11648^2 + 7329^2 .

It is not a de Polignac number, because 189390145 - 2¹ = 189390143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 189390098 and 189390107.

It is not an unprimeable number, because it can be changed into a prime (189390143) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 386266 + ... + 386755.

It is an arithmetic number, because the mean of its divisors is an integer number (22031127).

Almost surely, 2^189390145 is an apocalyptic number.

It is an amenable number.

189390145 is a deficient number, since it is larger than the sum of its proper divisors (74983379).

189390145 is an equidigital number, since it uses as much as digits as its factorization.

189390145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773040 (or 773033 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 189390145 is about 13761.9092062112. The cubic root of 189390145 is about 574.2739620229.

The spelling of 189390145 in words is "one hundred eighty-nine million, three hundred ninety thousand, one hundred forty-five".