1242530 has 16 divisors (see below), whose sum is σ = 2368440. Its totient is φ = 467712.

The previous prime is 1242517. The next prime is 1242569. The reversal of 1242530 is 352421.

It can be written as a sum of positive squares in 4 ways, for example, as 1100401 + 142129 = 1049^2 + 377^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1242499 and 1242508.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3485 + ... + 3824.

2^1242530 is an apocalyptic number.

1242530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1242530 is a deficient number, since it is larger than the sum of its proper divisors (1125910).

1242530 is a wasteful number, since it uses less digits than its factorization.

1242530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7333.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 1242530 is about 1114.6882972383. The cubic root of 1242530 is about 107.5067239349.

Adding to 1242530 its reverse (352421), we get a palindrome (1594951).

The spelling of 1242530 in words is "one million, two hundred forty-two thousand, five hundred thirty".