1230643 has 4 divisors (see below), whose sum is σ = 1248048. Its totient is φ = 1213240.

The previous prime is 1230637. The next prime is 1230667. The reversal of 1230643 is 3460321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3460321 = 373 ⋅9277.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1230643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1230643.

It is not an unprimeable number, because it can be changed into a prime (1230343) 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 in 3 ways as a sum of consecutive naturals, for example, 8596 + ... + 8737.

It is an arithmetic number, because the mean of its divisors is an integer number (312012).

2^1230643 is an apocalyptic number.

1230643 is a deficient number, since it is larger than the sum of its proper divisors (17405).

1230643 is an equidigital number, since it uses as much as digits as its factorization.

1230643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17404.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1230643 is about 1109.3434995528. The cubic root of 1230643 is about 107.1627940889.

Adding to 1230643 its reverse (3460321), we get a palindrome (4690964).

The spelling of 1230643 in words is "one million, two hundred thirty thousand, six hundred forty-three".