1225904 has 20 divisors (see below), whose sum is σ = 2515464. Its totient is φ = 576768.

The previous prime is 1225897. The next prime is 1225907. The reversal of 1225904 is 4095221.

It is a self number, because there is not a number n which added to its sum of digits gives 1225904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1982 + ... + 2525.

2^1225904 is an apocalyptic number.

It is an amenable number.

1225904 is an abundant number, since it is smaller than the sum of its proper divisors (1289560).

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

1225904 is a wasteful number, since it uses less digits than its factorization.

1225904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4532 (or 4526 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1225904 is about 1107.2054913159. The cubic root of 1225904 is about 107.0250618210.

The spelling of 1225904 in words is "one million, two hundred twenty-five thousand, nine hundred four".