189450505 has 4 divisors (see below), whose sum is σ = 227340612. Its totient is φ = 151560400.

The previous prime is 189450493. The next prime is 189450529. The reversal of 189450505 is 505054981.

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 67502656 + 121947849 = 8216^2 + 11043^2 .

It is not a de Polignac number, because 189450505 - 2⁹ = 189449993 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18945046 + ... + 18945055.

It is an arithmetic number, because the mean of its divisors is an integer number (56835153).

Almost surely, 2^189450505 is an apocalyptic number.

It is an amenable number.

189450505 is a deficient number, since it is larger than the sum of its proper divisors (37890107).

189450505 is an equidigital number, since it uses as much as digits as its factorization.

189450505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37890106.

The product of its (nonzero) digits is 36000, while the sum is 37.

The square root of 189450505 is about 13764.1020411794. The cubic root of 189450505 is about 574.3349639554.

The spelling of 189450505 in words is "one hundred eighty-nine million, four hundred fifty thousand, five hundred five".