1213648 has 10 divisors (see below), whose sum is σ = 2351474. Its totient is φ = 606816.

The previous prime is 1213643. The next prime is 1213651. The reversal of 1213648 is 8463121.

It can be written as a sum of positive squares in only one way, i.e., 788544 + 425104 = 888^2 + 652^2 .

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 pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37911 + ... + 37942.

2^1213648 is an apocalyptic number.

It is an amenable number.

1213648 is a deficient number, since it is larger than the sum of its proper divisors (1137826).

1213648 is an equidigital number, since it uses as much as digits as its factorization.

1213648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75861 (or 75855 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 1213648 is about 1101.6569338955. The cubic root of 1213648 is about 106.6672048584.

Adding to 1213648 its reverse (8463121), we get a palindrome (9676769).

The spelling of 1213648 in words is "one million, two hundred thirteen thousand, six hundred forty-eight".