1231646 has 16 divisors (see below), whose sum is σ = 2010624. Its totient is φ = 562464.

The previous prime is 1231631. The next prime is 1231663. The reversal of 1231646 is 6461321.

It is a happy number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 3116 + ... + 3488.

It is an arithmetic number, because the mean of its divisors is an integer number (125664).

2^1231646 is an apocalyptic number.

1231646 is a deficient number, since it is larger than the sum of its proper divisors (778978).

1231646 is a wasteful number, since it uses less digits than its factorization.

1231646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515.

The product of its digits is 864, while the sum is 23.

The square root of 1231646 is about 1109.7954766532. The cubic root of 1231646 is about 107.1918994956.

Adding to 1231646 its reverse (6461321), we get a palindrome (7692967).

The spelling of 1231646 in words is "one million, two hundred thirty-one thousand, six hundred forty-six".