1225724 has 6 divisors (see below), whose sum is σ = 2145024. Its totient is φ = 612860.

The previous prime is 1225723. The next prime is 1225727. The reversal of 1225724 is 4275221.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1225724.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153212 + ... + 153219.

It is an arithmetic number, because the mean of its divisors is an integer number (357504).

2^1225724 is an apocalyptic number.

It is an amenable number.

1225724 is a deficient number, since it is larger than the sum of its proper divisors (919300).

1225724 is a wasteful number, since it uses less digits than its factorization.

1225724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306435 (or 306433 counting only the distinct ones).

The product of its digits is 1120, while the sum is 23.

The square root of 1225724 is about 1107.1242026078. The cubic root of 1225724 is about 107.0198233863.

The spelling of 1225724 in words is "one million, two hundred twenty-five thousand, seven hundred twenty-four".