1205939 has 6 divisors (see below), whose sum is σ = 1402884. Its totient is φ = 1033620.

The previous prime is 1205921. The next prime is 1205947. The reversal of 1205939 is 9395021.

It is not a de Polignac number, because 1205939 - 2¹² = 1201843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1205969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12257 + ... + 12354.

It is an arithmetic number, because the mean of its divisors is an integer number (233814).

2^1205939 is an apocalyptic number.

1205939 is a deficient number, since it is larger than the sum of its proper divisors (196945).

1205939 is an equidigital number, since it uses as much as digits as its factorization.

1205939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24625 (or 24618 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 1205939 is about 1098.1525394953. The cubic root of 1205939 is about 106.4408776451.

The spelling of 1205939 in words is "one million, two hundred five thousand, nine hundred thirty-nine".