1239906 has 8 divisors (see below), whose sum is σ = 2479824. Its totient is φ = 413300.

The previous prime is 1239899. The next prime is 1239911. The reversal of 1239906 is 6099321.

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

1239906 is an admirable number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 103320 + ... + 103331.

It is an arithmetic number, because the mean of its divisors is an integer number (309978).

2^1239906 is an apocalyptic number.

1239906 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1239906 is a wasteful number, since it uses less digits than its factorization.

1239906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206656.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 1239906 is about 1113.5106645201. The cubic root of 1239906 is about 107.4309923076.

It can be divided in two parts, 1239 and 906, that added together give a triangular number (2145 = T₆₅).

The spelling of 1239906 in words is "one million, two hundred thirty-nine thousand, nine hundred six".