1989305 has 8 divisors (see below), whose sum is σ = 2451912. Its totient is φ = 1548288.

The previous prime is 1989277. The next prime is 1989307. The reversal of 1989305 is 5039891.

It can be written as a sum of positive squares in 4 ways, for example, as 1075369 + 913936 = 1037^2 + 956^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1989305 - 2⁶ = 1989241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1989307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5192 + ... + 5561.

It is an arithmetic number, because the mean of its divisors is an integer number (306489).

2^1989305 is an apocalyptic number.

It is an amenable number.

1989305 is a deficient number, since it is larger than the sum of its proper divisors (462607).

1989305 is a wasteful number, since it uses less digits than its factorization.

1989305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10795.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 1989305 is about 1410.4272402361. The cubic root of 1989305 is about 125.7671225533.

The spelling of 1989305 in words is "one million, nine hundred eighty-nine thousand, three hundred five".