1989205 has 8 divisors (see below), whose sum is σ = 2512800. Its totient is φ = 1507536.

The previous prime is 1989203. The next prime is 1989217. The reversal of 1989205 is 5029891.

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

It is not a de Polignac number, because 1989205 - 2¹ = 1989203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10375 + ... + 10564.

It is an arithmetic number, because the mean of its divisors is an integer number (314100).

2^1989205 is an apocalyptic number.

It is an amenable number.

1989205 is a deficient number, since it is larger than the sum of its proper divisors (523595).

1989205 is a wasteful number, since it uses less digits than its factorization.

1989205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20963.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 1989205 is about 1410.3917895393. The cubic root of 1989205 is about 125.7650151300.

The spelling of 1989205 in words is "one million, nine hundred eighty-nine thousand, two hundred five".