1223649 has 12 divisors (see below), whose sum is σ = 2020096. Its totient is φ = 699192.

The previous prime is 1223633. The next prime is 1223683. The reversal of 1223649 is 9463221.

1223649 is a `hidden beast` number, since 12 + 2 + 3 + 649 = 666.

It is not a de Polignac number, because 1223649 - 2⁴ = 1223633 is a prime.

It is a Duffinian number.

1223649 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1223689) 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 11 ways as a sum of consecutive naturals, for example, 9649 + ... + 9774.

2^1223649 is an apocalyptic number.

It is an amenable number.

1223649 is a deficient number, since it is larger than the sum of its proper divisors (796447).

1223649 is a wasteful number, since it uses less digits than its factorization.

1223649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19436 (or 19433 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 1223649 is about 1106.1866931038. The cubic root of 1223649 is about 106.9593988096.

The spelling of 1223649 in words is "one million, two hundred twenty-three thousand, six hundred forty-nine".