1213646 has 8 divisors (see below), whose sum is σ = 2080560. Its totient is φ = 520128.

The previous prime is 1213643. The next prime is 1213651. The reversal of 1213646 is 6463121.

It is a happy number.

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

It is a super-2 number, since 2×1213646² = 2945873226632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213643) 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, 43331 + ... + 43358.

It is an arithmetic number, because the mean of its divisors is an integer number (260070).

2^1213646 is an apocalyptic number.

1213646 is a deficient number, since it is larger than the sum of its proper divisors (866914).

1213646 is an equidigital number, since it uses as much as digits as its factorization.

1213646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86698.

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

The square root of 1213646 is about 1101.6560261715. The cubic root of 1213646 is about 106.6671462652.

Adding to 1213646 its reverse (6463121), we get a palindrome (7676767).

The spelling of 1213646 in words is "one million, two hundred thirteen thousand, six hundred forty-six".