1299205 has 4 divisors (see below), whose sum is σ = 1559052. Its totient is φ = 1039360.

The previous prime is 1299203. The next prime is 1299209. The reversal of 1299205 is 5029921.

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 285156 + 1014049 = 534^2 + 1007^2 .

It is not a de Polignac number, because 1299205 - 2¹ = 1299203 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129916 + ... + 129925.

It is an arithmetic number, because the mean of its divisors is an integer number (389763).

2^1299205 is an apocalyptic number.

It is an amenable number.

1299205 is a deficient number, since it is larger than the sum of its proper divisors (259847).

1299205 is an equidigital number, since it uses as much as digits as its factorization.

1299205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259846.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 1299205 is about 1139.8267412199. The cubic root of 1299205 is about 109.1170361453.

The spelling of 1299205 in words is "one million, two hundred ninety-nine thousand, two hundred five".