1229904 has 100 divisors (see below), whose sum is σ = 3886036. Its totient is φ = 373248.

The previous prime is 1229903. The next prime is 1229911. The reversal of 1229904 is 4099221.

It can be written as a sum of positive squares in 2 ways, for example, as 419904 + 810000 = 648^2 + 900^2 .

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

It is a nialpdrome in base 6.

It is a zygodrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229903) 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 in 19 ways as a sum of consecutive naturals, for example, 16812 + ... + 16884.

2^1229904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1229904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1943018).

1229904 is an abundant number, since it is smaller than the sum of its proper divisors (2656132).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1229904 is a wasteful number, since it uses less digits than its factorization.

1229904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1229904 is about 1109.0103696540. The cubic root of 1229904 is about 107.1413394071.

1229904 divided by its product of nonzero digits (1296) gives a palindrome (949).

The spelling of 1229904 in words is "one million, two hundred twenty-nine thousand, nine hundred four".