1242225 has 18 divisors (see below), whose sum is σ = 2225366. Its totient is φ = 662400.

The previous prime is 1242221. The next prime is 1242233. The reversal of 1242225 is 5222421.

It can be written as a sum of positive squares in 3 ways, for example, as 23409 + 1218816 = 153^2 + 1104^2 .

It is not a de Polignac number, because 1242225 - 2² = 1242221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1242198 and 1242207.

It is not an unprimeable number, because it can be changed into a prime (1242221) 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 17 ways as a sum of consecutive naturals, for example, 2536 + ... + 2985.

2^1242225 is an apocalyptic number.

1242225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1242225 is a deficient number, since it is larger than the sum of its proper divisors (983141).

1242225 is a wasteful number, since it uses less digits than its factorization.

1242225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5537 (or 5529 counting only the distinct ones).

The product of its digits is 320, while the sum is 18.

The square root of 1242225 is about 1114.5514792956. The cubic root of 1242225 is about 107.4979267673.

Adding to 1242225 its reverse (5222421), we get a palindrome (6464646).

The spelling of 1242225 in words is "one million, two hundred forty-two thousand, two hundred twenty-five".