1205906 has 8 divisors (see below), whose sum is σ = 1948044. Its totient is φ = 556560.

The previous prime is 1205903. The next prime is 1205921. The reversal of 1205906 is 6095021.

It can be written as a sum of positive squares in 2 ways, for example, as 1190281 + 15625 = 1091^2 + 125^2 .

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

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1205903) 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, 23165 + ... + 23216.

2^1205906 is an apocalyptic number.

1205906 is a deficient number, since it is larger than the sum of its proper divisors (742138).

1205906 is a wasteful number, since it uses less digits than its factorization.

1205906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46396.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 1205906 is about 1098.1375141575. The cubic root of 1205906 is about 106.4399067333.

The spelling of 1205906 in words is "one million, two hundred five thousand, nine hundred six".