1224639 has 20 divisors (see below), whose sum is σ = 1971816. Its totient is φ = 752976.

The previous prime is 1224637. The next prime is 1224673. The reversal of 1224639 is 9364221.

1224639 is a `hidden beast` number, since 1 + 2 + 24 + 639 = 666.

It is not a de Polignac number, because 1224639 - 2¹ = 1224637 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224637) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 472 + ... + 1634.

2^1224639 is an apocalyptic number.

1224639 is a deficient number, since it is larger than the sum of its proper divisors (747177).

1224639 is a wasteful number, since it uses less digits than its factorization.

1224639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188 (or 1179 counting only the distinct ones).

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

The square root of 1224639 is about 1106.6340858658. The cubic root of 1224639 is about 106.9882363985.

It can be divided in two parts, 122 and 4639, that added together give a square (4761 = 69²).

The spelling of 1224639 in words is "one million, two hundred twenty-four thousand, six hundred thirty-nine".