1389205 has 8 divisors (see below), whose sum is σ = 1683000. Its totient is φ = 1100736.

The previous prime is 1389191. The next prime is 1389209. The reversal of 1389205 is 5029831.

It can be written as a sum of positive squares in 4 ways, for example, as 544644 + 844561 = 738^2 + 919^2 .

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 1389205 - 2⁵ = 1389173 is a prime.

1389205 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389209) 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, 730 + ... + 1819.

It is an arithmetic number, because the mean of its divisors is an integer number (210375).

2^1389205 is an apocalyptic number.

It is an amenable number.

1389205 is a deficient number, since it is larger than the sum of its proper divisors (293795).

1389205 is a wasteful number, since it uses less digits than its factorization.

1389205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2663.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1389205 is about 1178.6454089335. The cubic root of 1389205 is about 111.5806223127.

The spelling of 1389205 in words is "one million, three hundred eighty-nine thousand, two hundred five".