189905345 has 16 divisors (see below), whose sum is σ = 261491328. Its totient is φ = 129696000.

The previous prime is 189905327. The next prime is 189905357. The reversal of 189905345 is 543509981.

It is a happy number.

189905345 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 189905345 - 2⁶ = 189905281 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 189905296 and 189905305.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2024 + ... + 19593.

It is an arithmetic number, because the mean of its divisors is an integer number (16343208).

Almost surely, 2^189905345 is an apocalyptic number.

It is an amenable number.

189905345 is a deficient number, since it is larger than the sum of its proper divisors (71585983).

189905345 is a wasteful number, since it uses less digits than its factorization.

189905345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21880.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 189905345 is about 13780.6148266324. The cubic root of 189905345 is about 574.7942250450.

The spelling of 189905345 in words is "one hundred eighty-nine million, nine hundred five thousand, three hundred forty-five".