1209646 has 4 divisors (see below), whose sum is σ = 1814472. Its totient is φ = 604822.

The previous prime is 1209631. The next prime is 1209647. The reversal of 1209646 is 6469021.

It is a semiprime because it is the product of two primes.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209647) 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 as a sum of consecutive naturals, namely, 302410 + ... + 302413.

It is an arithmetic number, because the mean of its divisors is an integer number (453618).

2^1209646 is an apocalyptic number.

1209646 is a deficient number, since it is larger than the sum of its proper divisors (604826).

1209646 is an equidigital number, since it uses as much as digits as its factorization.

1209646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604825.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1209646 is about 1099.8390791384. The cubic root of 1209646 is about 106.5498308396.

The spelling of 1209646 in words is "one million, two hundred nine thousand, six hundred forty-six".