189845409 has 64 divisors (see below), whose sum is σ = 303367680. Its totient is φ = 104509440.

The previous prime is 189845399. The next prime is 189845429. The reversal of 189845409 is 904548981.

189845409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 189845409 - 2¹⁷ = 189714337 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (189845429) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1741647 + ... + 1741755.

It is an arithmetic number, because the mean of its divisors is an integer number (4740120).

Almost surely, 2^189845409 is an apocalyptic number.

It is an amenable number.

189845409 is a deficient number, since it is larger than the sum of its proper divisors (113522271).

189845409 is a wasteful number, since it uses less digits than its factorization.

189845409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250.

The product of its (nonzero) digits is 414720, while the sum is 48.

The square root of 189845409 is about 13778.4400060384. The cubic root of 189845409 is about 574.7337484399.

The spelling of 189845409 in words is "one hundred eighty-nine million, eight hundred forty-five thousand, four hundred nine".